Cita APA (7a ed.)

Oman, C., & Beeler, J. H. (1960). The art of war in the middle ages, A.D. 378-1515. Great Seal Books.

Cita Chicago Style (17a ed.)

Oman, Charles, y John H. Beeler. The Art of War in the Middle Ages, A.D. 378-1515. Ithaca [etc.]: Great Seal Books, 1960.

Cita MLA (9a ed.)

Oman, Charles, y John H. Beeler. The Art of War in the Middle Ages, A.D. 378-1515. Great Seal Books, 1960.