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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Washington Agricultural Experiment Station và 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.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Washington Agricultural Experiment Station và Raymond Allen Gilkeson. Soil Map of the Columbia Basin Project--Washington. Washington Agricultural Experiment Stations, Institute of Agricultural Sciences, State College of Washington, 1958.