APA (7th ed.) Citation

(1981). What is Sufism? (2nd ed.). Unwin Paperbacks.

Chicago Style (17th ed.) Citation

What Is Sufism? 2nd ed. London [etc.]: Unwin Paperbacks, 1981.

MLA (9th ed.) Citation

What Is Sufism? 2nd ed. Unwin Paperbacks, 1981.

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