APA (7th ed.) Citation

Zwemer, S. M. (1949). Francis of Assisi and Islam. The Muslim world, 39(4), 247-251. doi:10.1111/j.1478-1913.1949.tb01016.x

Chicago Style (17th ed.) Citation

Zwemer, Samuel M. "Francis of Assisi and Islam." The Muslim World 39, no. 4 (1949): 247-251, https://doi.org/10.1111/j.1478-1913.1949.tb01016.x.

MLA (9th ed.) Citation

Zwemer, Samuel M. "Francis of Assisi and Islam." The Muslim World, vol. 39, no. 4, 1949, pp. 247-251, https://doi.org/10.1111/j.1478-1913.1949.tb01016.x.