McGill-Warner Co, Great Northern Railway Company (U.S.), & Grindhem, M. J. (1937). Great Northern Railway map of the United States. McGill-Warner.
Cita Chicago Style (17a ed.)McGill-Warner Co, Great Northern Railway Company (U.S.), y M. J. Grindhem. Great Northern Railway Map of the United States. St. Paul: McGill-Warner, 1937.
Cita MLA (8a ed.)McGill-Warner Co, et al. Great Northern Railway Map of the United States. McGill-Warner, 1937.
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