Buku Teks
Little,Brown and Company, [date of publication not identified]
Buku Teks
Brazier, Gil, author
Cavendish, 1996
Buku Teks
Schroeder, Milton R., author
Warren, Gorham & Lamont, 1995
Buku Teks
Mann, Richard A., author
South Western Cengage Learning, 2011
Buku Teks