APA (7th ed.) Citation

Oman, C. W. C. (2013). The Art of War in the Middle Ages A.D. 378-1515. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oman, C. W. C. The Art of War in the Middle Ages A.D. 378-1515. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Oman, C. W. C. The Art of War in the Middle Ages A.D. 378-1515. Project Gutenberg, 2013.

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