Willging, E. P. (1949). The Index to Catholic pamphlets in the English language. Catholic University of America Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWillging, Eugene P. The Index to Catholic Pamphlets in the English Language. Washington, D.C.: Catholic University of America Press, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWillging, Eugene P. The Index to Catholic Pamphlets in the English Language. Catholic University of America Press, 1949.
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