Freeman, O. W. (1940). Geology of Grand Coulee: The damsite and neighboring geological wonders (Rev. ed.). O.W. Freeman.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreeman, Otis W. Geology of Grand Coulee: The Damsite and Neighboring Geological Wonders. Rev. ed. Cheney, Wash.: O.W. Freeman, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFreeman, Otis W. Geology of Grand Coulee: The Damsite and Neighboring Geological Wonders. Rev. ed. O.W. Freeman, 1940.
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