APA (7th ed.) Citation

Mommsen, T., Bryans, C., & Hendy, F. (1959). The history of Rome. Philosophical Library.

Chicago Style (17th ed.) Citation

Mommsen, Theodor, C. Bryans, and F.J.R Hendy. The History of Rome. New York: Philosophical Library, 1959.

MLA (9th ed.) Citation

Mommsen, Theodor, et al. The History of Rome. Philosophical Library, 1959.