APA (7th ed.) Citation

Shah, I. (1977). The Sufis. The Octagon Press.

Chicago Style (17th ed.) Citation

Shah, Idries. The Sufis. London: The Octagon Press, 1977.

MLA (8th ed.) Citation

Shah, Idries. The Sufis. The Octagon Press, 1977.

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