APA (7th ed.) Citation

Khan & Syed Athar Husain. (1982). The pious caliphs. Islamic Book Publishers.

Chicago Style (17th ed.) Citation

Khan and Syed Athar Husain. The Pious Caliphs. Kuwait: Islamic Book Publishers, 1982.

MLA (8th ed.) Citation

Khan and Syed Athar Husain. The Pious Caliphs. Islamic Book Publishers, 1982.