Nan, Lin, author
Bobs-Merril Educations, 1977
Buku Teks
Littlejohn, Stephen W, author
Thomson, 2005
Buku Teks
Tubbs, Stewart L., author
McGraw-Hill, 2008
Buku Teks
Knapp, Mark L., author
Allyn and Bacon, 1996
Buku Teks
O`Shaughnessy, Douglas, 1950-, author
Addison-Wesley, 1987
Buku Teks