APA-referens (7:e uppl.)

Blondel, M., Dru, A., & Trethowan, I. (1964). The letter on apologetics, and, History and dogma. Holt, Rinehart and Winston.

Chicago-referens (17:e uppl.)

Blondel, Maurice, Alexander Dru, och Illtyd Trethowan. The Letter on Apologetics, and, History and Dogma. New York: Holt, Rinehart and Winston, 1964.

MLA-referens (9:e uppl.)

Blondel, Maurice, et al. The Letter on Apologetics, and, History and Dogma. Holt, Rinehart and Winston, 1964.