Parker, R. L., & Calkins, J. A. (1964). Geology of the Curlew quadrangle, Ferry County, Washington. U.S. Govt. Print. Off..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रParker, Raymond L., और James Alfred Calkins. Geology of the Curlew Quadrangle, Ferry County, Washington. Washington: U.S. Govt. Print. Off., 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रParker, Raymond L., और James Alfred Calkins. Geology of the Curlew Quadrangle, Ferry County, Washington. U.S. Govt. Print. Off., 1964.
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