APA (7th ed.) Citation

Mayer, H. E. (1972). The Crusades / by H.E. Mayer. O.U.P..

Chicago Style (17th ed.) Citation

Mayer, H. E. The Crusades / by H.E. Mayer. O.U.P., 1972.

MLA (9th ed.) Citation

Mayer, H. E. The Crusades / by H.E. Mayer. O.U.P., 1972.

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