Pritchett, C. Herman, author
McGraw-Hill, 1981
Buku Teks
Current, Richard N., author
Alfred A. Knopf, 1965
Buku Teks
edited by Henry Steele Commager
Appleton-Century-Crofts, 1949
Buku Referensi
edited by David J. Rothman and Sheila M. Rothman
Basic Books, 1975
Buku Teks
Graebner, Norman A., author
McGraw-Hill, 1975
Buku Teks