A Problematic Relationship: A Study of the Theological-Ethical Theme in the Writings of James M. Gustafson. Tagaytay Studies 4, Divine Word Seminary, 1986
PAGKAMAKATAO: Reflections on the Theological Virtues in the Philippine Context. Divine Word Publications, Manila 1987
LOOB: The Filipino Within - A Preliminary Investigation into a Pre-theological Moral Anthropology. Divine Word Publications, Manila 1989
BUTING PINOY: Probe Essays on Value as Filipino. Logos Publications, Manila 1992
PAGKAMAKABUHAY: On the side of life - Prolegomena for Bioethics from a Filipino-Christian Perspective. Logos Publications, Manila 1994
KALOOB NI Kristo: A Filipino Christian Account of Conscience. Logos Publications, Manila 2003 (Gintong Aklat Award 2004, Religious books category, of the national Book Development Association of the Philippines)