Northern Pacific Railway Company. Agricultural Development Department. (1937). Washington and northern Idaho showing lines of the Northern Pacific Ry. Agricultural Development Dept., Northern Pacific Railway.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Northern Pacific Railway Company. Agricultural Development Department. Washington and Northern Idaho Showing Lines of the Northern Pacific Ry. St. Paul, Minn.: Agricultural Development Dept., Northern Pacific Railway, 1937.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Northern Pacific Railway Company. Agricultural Development Department. Washington and Northern Idaho Showing Lines of the Northern Pacific Ry. Agricultural Development Dept., Northern Pacific Railway, 1937.
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