Terence Vincent Powderly. The American Catholic History Research Center and University Archives.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTerence Vincent Powderly. The American Catholic History Research Center and University Archives.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTerence Vincent Powderly. The American Catholic History Research Center and University Archives.
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