Haycraft, William R. (2000) Yellow Steel: The Story of the Earthmoving Equipment Industry University of Illinois Press, Urbana, Illinois, pages 183-184, ISBN0-252-02497-4
Haycraft, William R. (2000) Yellow Steel: The Story of the Earthmoving Equipment Industry University of Illinois Press, Urbana, Illinois, page 260, ISBN0-252-02497-4
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books.google.co.uk
Will, Oscar H. (2007) Payline: International Harvester's Construction Equipment Division MBI, St. Paul, Minnesota, page 144, ISBN978-0-7603-2458-5