APA (7th ed.) Citation

Hale William Harlan, Highet, G., & Payne Robert Author. (1966). The horizon book of ancient rome. American Heritage Publishing.

Chicago Style (17th ed.) Citation

Hale William Harlan, Gilbert Highet, and Payne Robert Author. The Horizon Book of Ancient Rome. New York: American Heritage Publishing, 1966.

MLA (9th ed.) Citation

Hale William Harlan, et al. The Horizon Book of Ancient Rome. American Heritage Publishing, 1966.