APA (7th ed.) Citation

Oman, C. W. C. (2011). The Byzantine Empire. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oman, Charles William Chadwick. The Byzantine Empire. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Oman, Charles William Chadwick. The Byzantine Empire. Project Gutenberg, 2011.

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