1. Aguilar, Mario (2011). Thomas Merton: Contemplation and Political Action, Society for Promoting Christian Knowledge.
2. Apel, William (2006). Signs of Peace: The Interfaith Letters of Thomas Merton, Orbis Books.
3. Arnold, Eberhard (1995). Why We Live in Community: With Two Interpretive Talks by Thomas Merton, Plough Publishing House.
4. Kasimow, Harold, and Sherwin, Byron (1991). No Religion Is an Island: Abraham Joshua Heschel and Interreligious Dialogue, Orbis Books.
5. Boff, Leonardo (1993). The Path to Hope: Fragments from a Theologian’s Journey, Orbis.