McGill-Warner Co & Grindhem, M. J. (1928). Great Northern Railway map of the United States. McGill-Warner Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcGill-Warner Co और M. J. Grindhem. Great Northern Railway Map of the United States. St. Paul, Minn.: McGill-Warner Co., 1928.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcGill-Warner Co और M. J. Grindhem. Great Northern Railway Map of the United States. McGill-Warner Co., 1928.
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