Martin, Michael Rheta
Encyclopedia of Latin-American history
The Bobbs Merrill, 1968
 Buku Referensi
Encyclopedia of American history : erlarged and update
edited by Richard B. Morris
Harper and Row , 1965
 Buku Referensi
Encyclopedia of American social history : volume I
Mary Kupiec Cayton, Elliott J. Gorn, Peter W. Williams, editors
Charles Scribner's Sons, 1993
 Buku Referensi
Encyclopedia of American social history : volume II
Mary Kupiec Cayton, Elliott J. Gorn, Peter W. Williams, editors
Charles Scribner's Sons, 1993
 Buku Referensi
Encyclopedia of American social history : volume III
Mary Kupiec Cayton, Elliott J. Gorn, Peter W. Williams, editors
Charles Scribner's Sons, 1993
 Buku Referensi