APA (7th ed.) Citation
Zwemer, S. M. (1909). Islam: A challenge to faith. Marshall Brothers.
Chicago Style (17th ed.) Citation
Zwemer, Samuel Marinus. Islam: A Challenge to Faith. London: Marshall Brothers, 1909.
MLA (9th ed.) Citation
Zwemer, Samuel Marinus. Islam: A Challenge to Faith. Marshall Brothers, 1909.
Warning: These citations may not always be 100% accurate.