Donaldson, N. C., & Giese, L. D. (1968). Soil survey, Spokane County, Washington. Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDonaldson, Norman C., और Laurence D. Giese. Soil Survey, Spokane County, Washington. Washington]: Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDonaldson, Norman C., और Laurence D. Giese. Soil Survey, Spokane County, Washington. Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
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