Space, R. S. (1964). The Clearwater story: A history of the Clearwater National Forest. U.S. Dept. of Agriculture, Forest Service, Northwest Region.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpace, Ralph S. The Clearwater Story: A History of the Clearwater National Forest. Missoula, Mont.: U.S. Dept. of Agriculture, Forest Service, Northwest Region, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpace, Ralph S. The Clearwater Story: A History of the Clearwater National Forest. U.S. Dept. of Agriculture, Forest Service, Northwest Region, 1964.
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