Schwager, M. (1947). Letter to Arno Heuduck, December 29, 1947. Saint Louis University Libraries Digitization Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchwager, Mortimer. Letter to Arno Heuduck, December 29, 1947. Saint Louis University Libraries Digitization Center, 1947.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSchwager, Mortimer. Letter to Arno Heuduck, December 29, 1947. Saint Louis University Libraries Digitization Center, 1947.
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