Cox, T. R. (1988). The park builders: A history of state parks in the Pacific northwest. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCox, Thomas R. The Park Builders: A History of State Parks in the Pacific Northwest. Seattle: University of Washington Press, 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCox, Thomas R. The Park Builders: A History of State Parks in the Pacific Northwest. University of Washington Press, 1988.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.