Tohutoro APA (7th ed.)
Zwemer, S. M. (1909). Islam: A challenge to faith. Marshall Brothers.
Tohutoru Kātū Chicago (17th ed.)
Zwemer, Samuel Marinus. Islam: A Challenge to Faith. London: Marshall Brothers, 1909.
Tohutoro MLA (9th ed.)
Zwemer, Samuel Marinus. Islam: A Challenge to Faith. Marshall Brothers, 1909.
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