Theology Week Manila, Aligan, R. E., & Sagut, J. C. (2009). Theology Week 2008: A symposium on natural law : proceedings of the ninth theology week of the faculty of sacred theology in cooperation with the faculty of philosophy and the institute of religion, University of Sto. Tomas, July 2008. Faculty of Sacred Theology, University of Santo Tomas.

Theology Week Manila, Rodel E. Aligan, and Joel C. Sagut. Theology Week 2008: A Symposium on Natural Law : Proceedings of the Ninth Theology Week of the Faculty of Sacred Theology in Cooperation with the Faculty of Philosophy and the Institute of Religion, University of Sto. Tomas, July 2008. Manila: Faculty of Sacred Theology, University of Santo Tomas, 2009.

Theology Week Manila, et al. Theology Week 2008: A Symposium on Natural Law : Proceedings of the Ninth Theology Week of the Faculty of Sacred Theology in Cooperation with the Faculty of Philosophy and the Institute of Religion, University of Sto. Tomas, July 2008. Faculty of Sacred Theology, University of Santo Tomas, 2009.