Gaya APA

al-Ashqar, U, S. (2008). Dunia Malaikat (Seri. 2). Riyadh: International Islamic Publishing House.

Gaya MLA

al-Ashqar, Umar, Sulaiman. "Dunia Malaikat". Seri. 2 Riyadh: International Islamic Publishing House, 2008. Text.