1. Aristotle (1885), The Politics of Aristotle, trans. B. Jowett, vol. 1, Clarendon Press, Oxford.
2. Aristotle (1957), Aristotelis Politica, ed. W. D. Ross, Aristotle’s Politica. Clarendon Press, Oxford.
3. Benedict XVI (2007), Enc. Spe salvi, https://www.vatican.va/content/benedict-xvi/en/encyclicals/documents/hf_ben-xvi_enc_20071130_spe-salvi.html.
4. J. Bocheński (1995), Między logiką a wiarą. Z Józefem M. Bocheńskim rozmawia Jan Parys [Between Logic and the Faith. J. Parys’ conversation with J. M. Bocheński], 3rd ed., Noir sur Blanc, Warszawa.
5. Boethius (1918), Theological Tractates and the Consolation of Philosophy, H. F. Stewart, William Heinemann Ltd., Harvard University Press, Cambridge, Massachusetts.