APA (7 वां संस्करण) प्रशस्ति पत्र

Maryland. Dept. of Economic Development. (1967). Directory of Maryland manufacturers. s.n.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Maryland. Dept. of Economic Development. Directory of Maryland Manufacturers. Annapolis, etc: s.n, 1967.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Maryland. Dept. of Economic Development. Directory of Maryland Manufacturers. s.n, 1967.

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