Bramer, George R.
Charles E. Merrill Publishing Company, 1981
Buku Teks
Greendwood, Jean
Oxford Oxford University Press, 1988
Buku Teks
LAmor, Louis
Bantam Book, 1986
Buku Teks
Powell, Hickman
Oxford Univertity Press, 1982
Buku Teks
Ryan, Cornelius
Simon & Schuster, 1966
Buku Teks