Frey, W. N. (1931). The act of religious profession: A brief historical synopsis and commentary. Catholic University of America.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFrey, Wolfgang Norbert. The Act of Religious Profession: A Brief Historical Synopsis and Commentary. Washington, D.C.: Catholic University of America, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFrey, Wolfgang Norbert. The Act of Religious Profession: A Brief Historical Synopsis and Commentary. Catholic University of America, 1931.
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