Kaiser, Joe
Goodheart-Willcox, 1998
Buku Teks
McPherson, George
Wiley, 1981
Buku Teks
Kostenko, M. P. (Mikhail Polievktovich), 1889-1976, author
Peace Publishers,
Buku Teks
Gingrich, Harold W.
Prentice-Hall, 1979
Buku Teks
Anderson, Leonard R.,
Reston Publishing, 1981
Buku Teks