Northern Pacific Railway Company & Wheeler, O. D. (1897). Wonderland '97-1906 .. Northern Pacific Railway.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorthern Pacific Railway Company और Olin D. Wheeler. Wonderland '97-1906 .. St. Paul: Northern Pacific Railway, 1897.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNorthern Pacific Railway Company और Olin D. Wheeler. Wonderland '97-1906 .. Northern Pacific Railway, 1897.
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