Thompson, T.R.
Gee & Co , 1973
Buku Teks
Solomon, Irving I., author
New American Library , 1968
Buku Teks
Brandon/Systems Press, 1970
Buku Teks
Kroenke, David M., 1946-, author
Mitchell Publishing, 1987
Buku Teks
Fuori, William M., author
Prentice-Hall, 1981
Buku Teks