Ullman, Neil R.
John Wiley & Sons, 1978
Buku Teks
Hoel, Paul Gerhard, 1905-
Wiley, 1982
Buku Teks
McClave, James T.
Prentice-Hall, 2000
Buku Teks
McClave, James T.
Dellen Publishing, 1979
Buku Teks
Hays, William Lee, 1926-1995
Harcourt Brace Colege, 1994
Buku Teks