Klaver 2018, p. 461. Klaver, J. M. I. (2018). "The Apologia". In Aquino, Frederick D.; King, Benjamin J. (eds.). The Oxford Handbook of John Henry Newman. Oxford University Press. pp. 454–475. ISBN978-0-19-871828-4.
Klaver 2018, pp. 461–463. Klaver, J. M. I. (2018). "The Apologia". In Aquino, Frederick D.; King, Benjamin J. (eds.). The Oxford Handbook of John Henry Newman. Oxford University Press. pp. 454–475. ISBN978-0-19-871828-4.