Niemoeller. Crowns, Crosses, and Stars. Purdue University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNiemoeller. Crowns, Crosses, and Stars. Purdue University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNiemoeller. Crowns, Crosses, and Stars. Purdue University Press.
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