Washington Agricultural Experiment Station & Gilkeson, R. A. (1958). Soil map of the Columbia Basin project--Washington. Washington Agricultural Experiment Stations, Institute of Agricultural Sciences, State College of Washington.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington Agricultural Experiment Station و Raymond Allen Gilkeson. Soil Map of the Columbia Basin Project--Washington. [Pullman, Wash.?: Washington Agricultural Experiment Stations, Institute of Agricultural Sciences, State College of Washington, 1958.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington Agricultural Experiment Station و Raymond Allen Gilkeson. Soil Map of the Columbia Basin Project--Washington. Washington Agricultural Experiment Stations, Institute of Agricultural Sciences, State College of Washington, 1958.