Zinn, Howard
HarperCollins Publishers, 2005
Buku Teks
Walker, Edward Everett, 1900-1974
Charles Scribner's Sons, 1943
Buku Teks
Boyd, Anne Morris
H.W. Wilson, 1949
Buku Teks SO
edited by Roy A. Grisham, Jr., Paul D. McConaughy
WM. H. Wise, 1966
Buku Referensi
MD : Bernan Press, 2004
Buku Teks