APA (7th ed.) Citation

Lot, F., Leon, P., & Leon, M. (1931). The end of the ancient world and the beginnings of the Middle Ages. A.A. Knopf.

Chicago Style (17th ed.) Citation

Lot, Ferdinand, Philip Leon, and Mariette Leon. The End of the Ancient World and the Beginnings of the Middle Ages. New York: A.A. Knopf, 1931.

MLA (9th ed.) Citation

Lot, Ferdinand, et al. The End of the Ancient World and the Beginnings of the Middle Ages. A.A. Knopf, 1931.