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.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Donaldson, Norman C., و 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Donaldson, Norman C., و Laurence D. Giese. Soil Survey, Spokane County, Washington. Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.