Henricksen, D. L. (1970). The State of Washington tourist resources and investment potential. Dept. of Commerce and Economic Development. Business and Economic Research Division.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHenricksen, Dean L. The State of Washington Tourist Resources and Investment Potential. Olympia: Dept. of Commerce and Economic Development. Business and Economic Research Division, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHenricksen, Dean L. The State of Washington Tourist Resources and Investment Potential. Dept. of Commerce and Economic Development. Business and Economic Research Division, 1970.
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