Wagner, G. A. (1931). Letter to P. W. H. Berlin-Treptow, January 22, 1931. Saint Louis University Libraries Digitization Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWagner, Gerdt A. Letter to P. W. H. Berlin-Treptow, January 22, 1931. Saint Louis University Libraries Digitization Center, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWagner, Gerdt A. Letter to P. W. H. Berlin-Treptow, January 22, 1931. Saint Louis University Libraries Digitization Center, 1931.
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