Washington State University. College of Engineering. Research Division & Washington State University. Bureau of Economic and Business Research. (1952). Directory of manufacturers, the state of Washington. State College of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington State University. College of Engineering. Research Division और Washington State University. Bureau of Economic and Business Research. Directory of Manufacturers, the State of Washington. Pullman, Wash.: State College of Washington, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington State University. College of Engineering. Research Division और Washington State University. Bureau of Economic and Business Research. Directory of Manufacturers, the State of Washington. State College of Washington, 1952.
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