Cary, William L.
The Foundation Press, 1970
Buku Teks
Crouse, William H., author
McGraw-Hill , 1984
Buku Teks
Crouse, William H., author
McGraw-Hil, 1977.
Buku Teks
McQuaig, Douglas J.
Houghton Mifflin, 1989
Buku Teks
Loudon, David L., author
McGraw-hill, 1984
Buku Teks