Jones, Leo
New York Cambridge University Press 1983,
Buku Teks
Holschuh, Louis W.
New York St. Martin's Press 1991,
Buku Teks
New York : Holt, Rinehart and Winston, 1995,
Buku Teks
Mackie, Benita, author
Upper Saddle River,N.J. Prentice Hall 1995,
Buku Teks
Cornog, Mary Wood
Springfield:Massachusetts Merriam-Webster, 1994,
Buku Teks