APA (7th ed.) Citation

Zwemer, S. M. (1915). The vital forces of Christianity and Islam: : six studies by missionaries to Moslems. Oxford University Press.

Chicago Style (17th ed.) Citation

Zwemer, S. M. The Vital Forces of Christianity and Islam: : Six Studies by Missionaries to Moslems. London: Oxford University Press, 1915.

MLA (9th ed.) Citation

Zwemer, S. M. The Vital Forces of Christianity and Islam: : Six Studies by Missionaries to Moslems. Oxford University Press, 1915.