VanHuss, Susie H.
South-Western Education Publishing, 1998
Buku Teks
Davis, Ken
Charles E. Merrill Publishing Company, 1983
Buku Teks
Sigband, Norman B.
Harper & Brothers Publ , 1960
Buku Teks
Weaver, Patricia C., author
Free Press, 1977
Buku Teks
Gartside, L. (Leonard), author
Macdonald and Evans, 1982
Buku Teks