Own works

• The Great Themes of Scripture: Old Testament (with Joseph Martos) (1987, reissued St Anthony Messenger Press, 1988) ISBN 978-0867160857
• The Great Themes of Scripture: New Testament (with Joseph Martos) (St Anthony Messenger Press, 1988) ISBN 978-0867160987
• Why Be Catholic?: Understanding Our Experience and Tradition (with Joseph Martos) (Saint Anthony Messenger Press, 1989) ISBN 978-0867161014
• Discovering the Enneagram: An Ancient Tool a New Spiritual Journey (with Andreas Ebert) (1990 and 1991, reissued by Crossroad Publishing Co ,U.S.; Reissue edition 1993) ISBN 978-0824511852
• Simplicity, Revised & Updated: The Freedom of Letting Go (1991, reissued by Crossroad Publishing Co ,U.S.; 2nd New edition of Revised edition edition, 2004) ISBN 978-0824521158
• The Wild Man's Journey: Reflections on Male Spirituality (with Joseph Martos) (1992, reissued by St Anthony Messenger Press; New edition edition 1996) ISBN 978-0867162790
• Near Occasions of Grace (Orbis Books (USA), 1993) ISBN 978-0883448526
• Quest for the Grail: Soul Work and the Sacred Journey (1994, reissued by Crossroad Publishing Co ,U.S.; New edition edition, 1997) ISBN 978-0824516543
• The Enneagram: A Christian Perspective (with Andreas Ebert) (1995, reissued by Crossroad Publishing Co ,U.S., 2002) ISBN 978-0824519506
• Enneagram 2: Advancing Spiritual Discernment (1995, reissued by Gracewing; New Ed edition 2008) ISBN 978-0852443200
• Experiencing the Enneagram (with Andreas Ebert) (Crossroad Publishing Co ,U.S., 1995) ISBN 978-0824512019
• Simplicity: The Art of Living (Crossroad Publishing Co ,U.S.; 2nd Revised edition edition , 1995) ISBN 978-0824512514
• Jesus' Plan for a New World: The Sermon on the Mount (with John Booker Fisher and J. Feister) (St Anthony Messenger Press, 1996) ISBN 978-0867162035
• Radical Grace: Daily Meditations (with John Bookser Feister, Editor) (1993, reissued by St Anthony Messenger Press, 1996) ISBN 978-0867162578
• The Good News According to Luke: Spiritual Reflections (Crossroad Publishing Co ,U.S., 1997) ISBN 978-0824514907
• Hope Against Darkness: The Transforming Vision of Saint Francis in a (St Anthony Messenger Press, 2001) ISBN 978-0867164404
• Everything Belongs: The Gift of Contemplative Prayer (Crossroad Publishing Co ,U.S.; 2nd Revised edition edition , 2003) ISBN 978-0824519957
• Adam's Return: The Five Promises of Male Initiation (Crossroad Publishing Co ,U.S., 2004) ISBN 978-0824522803
• Soul Brothers: Men in the Bible Speak to Men Today (with art by Louis S. Glanzman) (Orbis Books (USA), 2004) ISBN 978-1570755347
• From Wild Man to Wise Man: Reflections on Male Spirituality (with Joseph Martos) (St Anthony Messenger Press, 2005) ISBN 978-0867167405
• Job & the Mystery of Suffering (1996, reissued by Gracewing, 2006) ISBN 978-0852443088
• Things Hidden: Scripture as Spirituality (Saint Anthony Messenger Press, 2008) ISBN 978-0867166590
• The Naked Now: Learning to See as the Mystics See (The Crossroad Publishing Company, 2009) ISBN 978-0824525439
• "The Spiritual Family and the Natural Family" (Tape set reference needed)

Contributions

• Foreword in Roots of Violence in the U.S. Culture: A Diagnosis Towards Healing by Richard Alain (Blue Dolphin Publishing, 1999) ISBN 978-1577330431
• Foreword in Meal Stories: The Gospel of Our Lives by Kathleen Casey (Thomas More Association, 2000) ISBN 978-0883474952
• The Franciscan Opinion in Stricken by God? Nonviolent Identification and the Victory of Christ (ed. by Brad Jersak and Michael Hardin) (William B Eerdmans Publishing Co, 2008) ISBN 978-0802862877)