Feder, Kenneth L.
Mayfield Publishing Company, 1997
Buku Teks
Wendt, Herbert
Houghton-Mifflin, 1956
Buku Teks
Bellwood, Peter
Auckland Collins 1978,
Buku Teks
Edel, May
Little, Brown, 1955
Buku Teks
Murray, Raymond W.
Bruce Publishing, 1943
Buku Teks