Hedges, James B. (December 1926). “The Colonization Work of the Northern Pacific Railroad”. 《Mississippi Valley Historical Review》 13 (3): 311–342. doi:10.2307/1893110. JSTOR1893110.
Cotroneo, Ross R. (1968). “Western Land Marketing by the Northern Pacific Railway”. 《Pacific Historical Review》 37 (3): 299–320. doi:10.2307/3636865. JSTOR3636865.
Murray, Stanley N. (Fall 1957). “Railroads and the Agricultural Development of the Red River Valley of the North, 1870-1890”. 《Agricultural History》 31 (4): 57–66. JSTOR3740486.
Hedges, James B. (December 1926). “The Colonization Work of the Northern Pacific Railroad”. 《Mississippi Valley Historical Review》 13 (3): 311–342. doi:10.2307/1893110. JSTOR1893110.
Cotroneo, Ross R. (1968). “Western Land Marketing by the Northern Pacific Railway”. 《Pacific Historical Review》 37 (3): 299–320. doi:10.2307/3636865. JSTOR3636865.