APA (7th ed.) Citation

Gomaa, I., Spuler, B., & Altenmüller, H. (1972). A historical chart of the Muslim world. Handbook of Oriental studies.

Chicago Style (17th ed.) Citation

Gomaa, Ibrahim, Bertold Spuler, and Hartwig Altenmüller. "A Historical Chart of the Muslim World." Handbook of Oriental Studies 1972.

MLA (9th ed.) Citation

Gomaa, Ibrahim, et al. "A Historical Chart of the Muslim World." Handbook of Oriental Studies, 1972.

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