Davis, Ken
Charles E. Merrill Publishing Company, 1983
Buku Teks
Sigband, Norman B.
Harper & Brothers Publ , 1960
Buku Teks
Weaver, Patricia C.
Free Press, 1977
Buku Teks
Gartside, L. (Leonard)
Macdonald and Evans, 1982
Buku Teks
Meyer, Harold E.
Prentice-Hall, 1992
Buku Referensi