APA (7th ed.) Citation

Guillaume, A. (1961). Islam (2nd rev. ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Guillaume, Alfred. Islam. 2nd rev. ed. Penguin Books, 1961.

MLA (9th ed.) Citation

Guillaume, Alfred. Islam. 2nd rev. ed. Penguin Books, 1961.

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