Op de drempel van het nieuwe kerkelijk recht, Leuven, WNC, 1983, 131p.
(co-editor: H. Degen).
Het nieuwe kerkelijk recht. Analyse van de Codex Iuris Canonici 1983, Leuven, Peeters/Universitaire Pers, 1985, XI + 258p.
De dynamiek van het recht in de Kerk, Leuven, WNC, 1986, 133p.
Canon 1095 en het gestrande huwelijk, 's Hertogenbosch, WNC, 1987, 112p.
(co-editors: L. De Fleurquin, H. Degen, K. Peeters, O. ter Reegen).
De parochie. Hoofdlijnen voor de structuren van een geloofsgemeenschap, Leuven, Acco, 1988, 215p. (co-editor: H. Degen).
De leek in de Kerk. Mogelijkheden, grenzen en perspectieven, Leuven, Peeters, 1989, 102p. (co-editors: H. Warnink en P. De Roo).
Beheer en beleid van katholieke instellingen, Leuven, Peeters, 1990, 311p.
De katholieke identiteit van instellingen en organisaties in het recht, Leuven, Peeters, 1990, 149 p. (co-editors: H. Warnink en P. De Roo).
European Consortium for Church-State Research Newsletter, Leuven, s.n., 1993, 52p.
Disciples and Discipline. European Debate on Human Rights in the Roman Catholic Church, Leuven, Peeters, 1993, 214p. (co-editors: C. Vander Stichele, A. van der Helm, B. van Dijk en S. Veliscek.)
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1994, Volume 1, IV + 86p.
Canon Law and Marriage. Monsignor W. Onclin Chair 1995, Leuven, Peeters, 1995, 36p.
Which Relationships between Churches and the European Union ? Thoughts for the Future. Quelles relations entre les églises et l'Union européenne ? Jalons pour l'avenir, Leuven, Peeters, 1995, 89 p. (co-editors: H.-J. Kiderlen, H. Tempel)
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1995, Volume 2, VII + 159p.
A Swing of the Pendulum. Canon Law in Modern Society. Monsignor W. Onclin Chair 1996, Leuven, Peeters, 1996, 64p.
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1996, Volume 3, X + 219p.
In Diversitate Unitas. Monsignor W. Onclin Chair 1997, Leuven, Peeters, 1997, 72p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1997, Volume 4, X + 238p.
Bridging Past and Future. Monsignor W. Onclin Revisited. Monsignor W. Onclin Chair 1998, Leuven, Peeters, 1998, 87p.
Parochie-assistenten. Leken als bedienaar van de eredienst?, Leuven, Peeters, 1998, X + 142p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1998, Volume 5, XIV+251p.
Church and State. Changing Paradigms. Monsignor W. Onclin Chair 1999, Leuven, Peeters, 1999, 73p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1999, Volume 6, XII+352p.
Canon Law and Realism. Monsignor W. Onclin Chair 2000, Leuven, Peeters, 2000, 92p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2000, Volume 7, VIII+431p.
Canon Law between Interpretation and Imagination. Monsignor W. Onclin Chair 2001, Leuven, Peeters, 2001, 88p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2001, Volume 8, VIII+376p.
Many Cultures, Many Faces. Monsignor W. Onclin Chair 2002, Leuven, Peeters, 2002, 112p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2002, Volume 9, XIV+411p.
Canon Law, Consultation and Consolation. Monsignor W. Onclin Chair 2003, Leuven, Peeters, 2003, 163p.
European Journal for Church and State Research. Revue Européenne des relation Église-État, 2003, VI = 271p.
Canonical Testament. Monsignor W. Onclin Chair 2004, Leuven, Peeters, 2004, 77p.
Religion and Society: Emerging Questions. Monsignor W. Onclin Chair 2005, Leuven, Peeters, 2005, 37p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2003, Volume 10, VII+271p.
European Journal for church and State Research. Revue européenne des relations Eglises-Etat, 2004, Volume 11, XVII+226p.
Homoseksualiteit en wijding. Juridische en maatschappelijke analyse van de kerkelijke instructie. Homosexuality and Holy Orders. Juridical and Social Analysis of the Ecclesiastical Instruction. Monsignor W. Onclin Chair 2006, Leuven, Peeters, 2008, 130p.
Islam, Europe and Emerging Legal Issues, Farnham/Burlington, Ashgate, 2012, XVII + 336p. (co-editor)
(co-editor: H. Degen).
Het nieuwe kerkelijk recht. Analyse van de Codex Iuris Canonici 1983, Leuven, Peeters/Universitaire Pers, 1985, XI + 258p.
De dynamiek van het recht in de Kerk, Leuven, WNC, 1986, 133p.
Canon 1095 en het gestrande huwelijk, 's Hertogenbosch, WNC, 1987, 112p.
(co-editors: L. De Fleurquin, H. Degen, K. Peeters, O. ter Reegen).
De parochie. Hoofdlijnen voor de structuren van een geloofsgemeenschap, Leuven, Acco, 1988, 215p. (co-editor: H. Degen).
De leek in de Kerk. Mogelijkheden, grenzen en perspectieven, Leuven, Peeters, 1989, 102p. (co-editors: H. Warnink en P. De Roo).
Beheer en beleid van katholieke instellingen, Leuven, Peeters, 1990, 311p.
De katholieke identiteit van instellingen en organisaties in het recht, Leuven, Peeters, 1990, 149 p. (co-editors: H. Warnink en P. De Roo).
European Consortium for Church-State Research Newsletter, Leuven, s.n., 1993, 52p.
Disciples and Discipline. European Debate on Human Rights in the Roman Catholic Church, Leuven, Peeters, 1993, 214p. (co-editors: C. Vander Stichele, A. van der Helm, B. van Dijk en S. Veliscek.)
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1994, Volume 1, IV + 86p.
Canon Law and Marriage. Monsignor W. Onclin Chair 1995, Leuven, Peeters, 1995, 36p.
Which Relationships between Churches and the European Union ? Thoughts for the Future. Quelles relations entre les églises et l'Union européenne ? Jalons pour l'avenir, Leuven, Peeters, 1995, 89 p. (co-editors: H.-J. Kiderlen, H. Tempel)
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1995, Volume 2, VII + 159p.
A Swing of the Pendulum. Canon Law in Modern Society. Monsignor W. Onclin Chair 1996, Leuven, Peeters, 1996, 64p.
European Journal for Church and State Research. Revue européenne des relations églises-état, Leuven, Peeters, 1996, Volume 3, X + 219p.
In Diversitate Unitas. Monsignor W. Onclin Chair 1997, Leuven, Peeters, 1997, 72p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1997, Volume 4, X + 238p.
Bridging Past and Future. Monsignor W. Onclin Revisited. Monsignor W. Onclin Chair 1998, Leuven, Peeters, 1998, 87p.
Parochie-assistenten. Leken als bedienaar van de eredienst?, Leuven, Peeters, 1998, X + 142p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1998, Volume 5, XIV+251p.
Church and State. Changing Paradigms. Monsignor W. Onclin Chair 1999, Leuven, Peeters, 1999, 73p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 1999, Volume 6, XII+352p.
Canon Law and Realism. Monsignor W. Onclin Chair 2000, Leuven, Peeters, 2000, 92p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2000, Volume 7, VIII+431p.
Canon Law between Interpretation and Imagination. Monsignor W. Onclin Chair 2001, Leuven, Peeters, 2001, 88p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2001, Volume 8, VIII+376p.
Many Cultures, Many Faces. Monsignor W. Onclin Chair 2002, Leuven, Peeters, 2002, 112p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2002, Volume 9, XIV+411p.
Canon Law, Consultation and Consolation. Monsignor W. Onclin Chair 2003, Leuven, Peeters, 2003, 163p.
European Journal for Church and State Research. Revue Européenne des relation Église-État, 2003, VI = 271p.
Canonical Testament. Monsignor W. Onclin Chair 2004, Leuven, Peeters, 2004, 77p.
Religion and Society: Emerging Questions. Monsignor W. Onclin Chair 2005, Leuven, Peeters, 2005, 37p.
European Journal for Church and State Research. Revue européenne des relations églises-état, 2003, Volume 10, VII+271p.
European Journal for church and State Research. Revue européenne des relations Eglises-Etat, 2004, Volume 11, XVII+226p.
Homoseksualiteit en wijding. Juridische en maatschappelijke analyse van de kerkelijke instructie. Homosexuality and Holy Orders. Juridical and Social Analysis of the Ecclesiastical Instruction. Monsignor W. Onclin Chair 2006, Leuven, Peeters, 2008, 130p.
Islam, Europe and Emerging Legal Issues, Farnham/Burlington, Ashgate, 2012, XVII + 336p. (co-editor)
