APA (7th ed.) Citation

Khayyam, O., Ali-Shah, O., & Graves, R. (1967). The rubaiyyat of Omar Khayaam. Cassell.

Chicago Style (17th ed.) Citation

Khayyam, Omar, Omar Ali-Shah, and Robert Graves. The Rubaiyyat of Omar Khayaam. London: Cassell, 1967.

MLA (8th ed.) Citation

Khayyam, Omar, et al. The Rubaiyyat of Omar Khayaam. Cassell, 1967.