Folse, Keith S.
Binarupa Aksara Press , 1993
Buku Teks
Richards, Jack C., author
Cambridge University Press, 2009
Buku Teks
Veer, Emily Vander, author
IDG Books Worldwide, Inc., 2001
Buku Teks
Wall, Bob.,
Prima Publi, 1992
Buku Teks
Lowe, James F., author
McGraw-Hill, 1983
Buku Teks