Hefner, R. W. The struggle for the soul of Islam: Robert W. Hefner. Understanding September 11.(2002).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHefner, Robert W. "The Struggle for the Soul of Islam: Robert W. Hefner." Understanding September 11.(2002) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रHefner, Robert W. "The Struggle for the Soul of Islam: Robert W. Hefner." Understanding September 11.(2002), .
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