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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington (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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)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.