by Cal M. Lague [and others]
Allyn and Bacon, 1982
Buku Teks
Gronbeck, Bruce E.
Scott, Foresman, 1979
Buku Teks
Gamble, Teri Kwal
Allyn and Bacon, 1994
Buku Teks
Lucas, Stephen E.
McGraw-Hill , 2004
Multimedia
Devito, Joseph A.
Harper and Row, 1984
Buku Teks