APA (7th ed.) Citation

Allies, T. W. (2012). The Formation of Christendom, Volume II. Project Gutenberg.

Chicago Style (17th ed.) Citation

Allies, T. W. The Formation of Christendom, Volume II. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Allies, T. W. The Formation of Christendom, Volume II. Project Gutenberg, 2012.

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