APA (7th ed.) Citation

Gulen, F., & Cetin,Muhammed. (2008). Questions & answers about Islam. Tughra, Inc.

Chicago Style (17th ed.) Citation

Gulen, Fethullah, and Cetin,Muhammed. Questions & Answers About Islam. New Jersey: Tughra, Inc, 2008.

MLA (9th ed.) Citation

Gulen, Fethullah, and Cetin,Muhammed. Questions & Answers About Islam. Tughra, Inc, 2008.

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