McGill-Warner Co & Grindhem, M. J. (1957). Great Northern Railway map of the United States (Rev. 1957.). McGill-Warner.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMcGill-Warner Co और M. J. Grindhem. Great Northern Railway Map of the United States. Rev. 1957. St. Paul: McGill-Warner, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMcGill-Warner Co और M. J. Grindhem. Great Northern Railway Map of the United States. Rev. 1957. McGill-Warner, 1957.
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