Washington (State). Department of Commerce and Economic Development. Business and Economic Research Division. Directory of Washington State manufacturers. Business and Economic Research Division, Dept. of Commerce and Economic Development.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Department of Commerce and Economic Development. Business and Economic Research Division. Directory of Washington State Manufacturers. Olympia: Business and Economic Research Division, Dept. of Commerce and Economic Development.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Department of Commerce and Economic Development. Business and Economic Research Division. Directory of Washington State Manufacturers. Business and Economic Research Division, Dept. of Commerce and Economic Development.