Stockdale, James B., author
Stanford University, 1984
Buku Teks
Davis, James W., Jr., author
Greenwood Press, 1980
Buku Teks
edited by Morton Borden
Rand McNally, 1961
Buku Teks
Ferraro, Geraldine, author
Bantam Books, 1985
Buku Teks
Barber, James David, author
Prentice-Hall, 1977
Buku Teks