APA (7th ed.) Citation

Zwemer, S. M. (1938). Islam a Sevenfold Problem. The Muslim world, 28(3), 217-222. doi:10.1111/j.1478-1913.1938.tb02438.x

Chicago Style (17th ed.) Citation

Zwemer, S. M. "Islam a Sevenfold Problem." The Muslim World 28, no. 3 (1938): 217-222, https://doi.org/10.1111/j.1478-1913.1938.tb02438.x.

MLA (9th ed.) Citation

Zwemer, S. M. "Islam a Sevenfold Problem." The Muslim World, vol. 28, no. 3, 1938, pp. 217-222, https://doi.org/10.1111/j.1478-1913.1938.tb02438.x.

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