APA (7th ed.) Citation

Omar Khayyam, FitzGerald, E., & Szyk, A. (1946). Rubaiyat of Omar Khayyam. The Heritage press.

Chicago Style (17th ed.) Citation

Omar Khayyam, Edward FitzGerald, and Arthur Szyk. Rubaiyat of Omar Khayyam. New York: The Heritage press, 1946.

MLA (9th ed.) Citation

Omar Khayyam, et al. Rubaiyat of Omar Khayyam. The Heritage press, 1946.