Etcheson, W. W. (1959). A statistical atlas of Washington counties: Physical, commercial, & industrial resources. Bureau of Business Research, College of Business Administration, University of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEtcheson, Warren Wade. A Statistical Atlas of Washington Counties: Physical, Commercial, & Industrial Resources. Seattle: Bureau of Business Research, College of Business Administration, University of Washington, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEtcheson, Warren Wade. A Statistical Atlas of Washington Counties: Physical, Commercial, & Industrial Resources. Bureau of Business Research, College of Business Administration, University of Washington, 1959.
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