APA (7th ed.) Citation

Hayes, P. J. (1936). Pope Pius XI. Washington, D.C..

Chicago Style (17th ed.) Citation

Hayes, Patrick Joseph. Pope Pius XI. Washington, D.C., 1936.

MLA (8th ed.) Citation

Hayes, Patrick Joseph. Pope Pius XI. Washington, D.C., 1936.

Warning: These citations may not always be 100% accurate.