Gaya APA

Harahap, S., Nasution, H, B. (2009). Ensiklopedia Akidah Islam (2009). Jakarta: Kencana Prenada Media Group.

Gaya MLA

Harahap, Syahrin., Nasution, Hasan, Bakti. "Ensiklopedia Akidah Islam". 2009 Jakarta: Kencana Prenada Media Group, 2009. Text books.