APA (7th ed.) Citation

Omar Khayyam, Whinfield, E. H., Nicolas, J. B., FitzGerald, E., & Arnot, R. (2012). The Sufistic Quatrains of Omar Khayyam. Project Gutenberg.

Chicago Style (17th ed.) Citation

Omar Khayyam, Edward Henry Whinfield, J. B. Nicolas, Edward FitzGerald, and Robert Arnot. The Sufistic Quatrains of Omar Khayyam. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Omar Khayyam, et al. The Sufistic Quatrains of Omar Khayyam. Project Gutenberg, 2012.

Warning: These citations may not always be 100% accurate.