Smith, G. O., & Willis, B. (1903). Contributions to the geology of Washington: Geology and physiography of central Washington. Govt. print. off..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmith, George Otis, और Bailey Willis. Contributions to the Geology of Washington: Geology and Physiography of Central Washington. Washington: Govt. print. off., 1903.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSmith, George Otis, और Bailey Willis. Contributions to the Geology of Washington: Geology and Physiography of Central Washington. Govt. print. off., 1903.
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