APA (7th ed.) Citation

Watt, W. M. (1979). What is Islam? (2. ed.). Longman.

Chicago Style (17th ed.) Citation

Watt, William Montgomery. What Is Islam? 2. ed. London [u.a.]: Longman, 1979.

MLA (8th ed.) Citation

Watt, William Montgomery. What Is Islam? 2. ed. Longman, 1979.

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