Locker, Kitty O., author
McGraw-Hill, 2004
Buku Teks
Quible, Zane K., author
Prentice-Hall, 1996
Buku Teks
Andrews, Deborah C.
Macmillan Publishing Company, 1988
Buku Teks
Treece, Marla, author
Allyn and Bacon, 1994
Buku Teks
Curtis, Dan B., author
Rosda Jayaputra, 1996
Buku Teks