APA (7th ed.) Citation

Omar Khayyam, Avery, P., & Heath-Stubbs, J. (1981). Rubaiy'at of Omar Khayyam. Penguin Books.

Chicago Style (17th ed.) Citation

Omar Khayyam, Peter Avery, and John Heath-Stubbs. Rubaiy'at of Omar Khayyam. London: Penguin Books, 1981.

MLA (9th ed.) Citation

Omar Khayyam, et al. Rubaiy'at of Omar Khayyam. Penguin Books, 1981.