Sayre, Wallace S., author
Barnes & Noble, 1964
Buku Teks
Posey, Rollin Bennett, author
Littlefield, Adam, 1958
Buku Teks
OConnor, Karen, author
Addison Wesley Longman, 2001
Buku Teks
Graebner, Norman A., author
McGraw-Hill, 1975
Buku Teks
Bailey, Thomas Andrew, 1902-1983, author
Prentice-Hall, 1980
Buku Teks