The Encyclopedia of American facts and dates
editor, Gorton Carruth
Thomas Y. Growell, 1962
 Buku Referensi
Clark, Victor S., author
History of manufactures in the United States volume III 1893-1928
Peter Smith, 1949
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Fogel, Robert William, author
Railroads and American economic growth : essays in econometrics history
Johns Hopkins Press, 1964
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Encyclopedia of American history : erlarged and update
edited by Richard B. Morris
Harper and Row , 1965
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The American family in social-historical/ Michael Gordon,(ed)
St.Martin's Press, 1983
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