Decker, Randall E.
Little, Brown And Company, 1980
Buku Teks
Decker, Randall E.
Little, Brown and Company, 1984
Buku Teks
Rorabacher, Louise E.
Harper & Row Publishers, 1985
Buku Teks
Brock, Dee, author
John Wiley & Sons, 1978
Buku Teks
Kearns, Francis E.
Holt, Rinehart and Winston, 1970
Buku Teks