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books.google.com
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.نسخة محفوظة 2022-04-07 على موقع واي باك مشين.
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.نسخة محفوظة 2022-04-07 على موقع واي باك مشين.