Helland, M. (1980). There were giants: The life of James H. Wilbur. M. Helland.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHelland, Maurice. There Were Giants: The Life of James H. Wilbur. Yakima, WA (5309 Crest Dr., Yakima 98908): M. Helland, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHelland, Maurice. There Were Giants: The Life of James H. Wilbur. M. Helland, 1980.
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