APA (7 वां संस्करण) प्रशस्ति पत्र

O'Toole, A. L. (1975). Challenged: The story of Edmund Rice and the Christian Brothers in North America since 1825. s.n..

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

O'Toole, A. L. Challenged: The Story of Edmund Rice and the Christian Brothers in North America Since 1825. [S.l.: s.n., 1975.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

O'Toole, A. L. Challenged: The Story of Edmund Rice and the Christian Brothers in North America Since 1825. s.n., 1975.