Rouse, Irving
McGraw-Hill, 1972
Buku Teks
Feder, Kenneth L.
Mayfield Publishing Company, 1997
Buku Teks
Wendt, Herbert, author
Houghton-Mifflin, 1956
Buku Teks
Bellwood, Peter, author
Auckland Collins 1978,
Buku Teks
Edel, May, author
Little, Brown, 1955
Buku Teks