Norden, R. (1985). Symbols and their meaning. Concordia.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorden, Rudolf. Symbols and Their Meaning. Louis: Concordia, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNorden, Rudolf. Symbols and Their Meaning. Concordia, 1985.
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