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3. Beecher, E. (1855). The Conflict of Ages; Or, the Great Debate on the Moral Relations of God and Man (7th ed.). Phillips, Sampson, and Co.
4. Chesterton, G. K. (2004). Orthodoxy. Dover.
5. Clement of Alexandria, Exhortation to the Heathen. Catholic Library. Retrieved April 25 (2023). from https://catholiclibrary.org/library/view?docId=/Synchronized-EN/anf.000053.ClementOfAlexandria.ExhortationtotheHeathen.html;chunk.id=00000005.