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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorthern 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.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNorthern 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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