Judkins, C. J. (1942). Trade and professional associations of the United States. U.S. Govt. Print. Off.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJudkins, Calvert Jay. Trade and Professional Associations of the United States. Washington: U.S. Govt. Print. Off, 1942.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJudkins, Calvert Jay. Trade and Professional Associations of the United States. U.S. Govt. Print. Off, 1942.
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