1. Pavel Florensky, The Pillar and Ground of the Truth: An Essay in Orthodox Theodicy in Twelve Letters, Translated by Boris Jakim. Introduced by Richard F. Gustafson (Princeton, NJ: Princeton University Press, 1997).
2. Sergei Bulgakov, The Bride of the Lamb, Translated by Boris Jakim (Grand Rapids, MI: Wm. B. Eerdmans Publishing Company, 2002).
3. Hans Urs von Balthasar, Presence and Thought: An Essay on the Religious Philosophy of. Gregory of Nyssa, Translated by Mark Sebanc (San Francisco, CA: A Communio Book, Ignatius Press, 1995).
4. G.W. Leibniz and S. Clarke, The Leibniz-Clarke Correspondence: Together with Extracts from Newton’s Principia and Optics. Edited by H.G. Alexander (Manchester, UK: Manchester University Press, 1956), 29.
5. Hans Urs von Balthasar, Theo-drama: The Action: Vol. 4, Translated by Graham Harrison (San Francisco, CA: Ignatius Press, 1995).