Kirk, R. (1974). Washington State national parks, historic sites, recreation areas, and natural landmarks. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKirk, Ruth. Washington State National Parks, Historic Sites, Recreation Areas, and Natural Landmarks. [Seattle: University of Washington Press, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKirk, Ruth. Washington State National Parks, Historic Sites, Recreation Areas, and Natural Landmarks. University of Washington Press, 1974.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.