Sterling D. Evans, Bound in Twine: The history and ecology of the Henequen-Wheat Complex for Mexico and the American and Canadian Plains, 1880-1950 (College Station, Texas: Texas A&M University Press, 2007), p. 4.
Katherine Greening (March 1927). "Early Life of John Francis Appleby". The Wisconsin Magazine of History. 10 (3). Wisconsin Historical Society: 310–312. JSTOR4630672.