Jernigan, Dale Kayser, author
Appleton & Lange, 1988
Buku Teks
Jelley, Herbert M., author
McGraw-Hill, 1985
Buku Teks
Goyal, R.C., author
Prenctice Hall of India, 1998
Buku Teks
Cleveland, Ohio, Lincoln Extension Institute
Buku Teks
Williams, Numan A., author
South Western , 1984
Buku Teks