Coffron, James W., author
Prentice-Hall, 1981
Buku Teks
Lenk, John D., author
Prentice-Hall, 1971
Buku Referensi
Rosenberg, Robert, author
Holt Rinehart and Winston, 1970
Buku Teks
Anderson, Howard, author
Newnes , 2003
Buku Teks
Genn, Robert C., author
Parker Publishing Company, 1977
Buku Referensi