Van Duyne, C. (1921). Soil survey of Spokane County, Washington. Government Printing Off..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVan Duyne, Cornelius. Soil Survey of Spokane County, Washington. Washington: Government Printing Off., 1921.
एमएलए (8वां संस्करण) प्रशस्ति पत्रVan Duyne, Cornelius. Soil Survey of Spokane County, Washington. Government Printing Off., 1921.
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