Grindstaff, Carl F., author
Christopher Publishing House, 1981
Buku Teks
Edgar, Donald Ernest
Prentice-Hall, 1980
Buku Teks
Berger, Peter L., author
Anchor Books, 1990
Buku Teks
Keith, Lyman A., author
Prentice-Hall, 1985
Buku Teks
Wright, Charles Robert, author
New York, N.Y. Random House 1966,
Buku Teks