Barrow, Mike
Prentice-Hall, 2001
Buku Teks SO
Bancroft, Gordon
McGraw-Hill , 1981
Buku Teks SO
McClave, James T.
Prentice-Hall, 2001
Buku Teks SO
Daniel, Wayne W.
Houghton Miffiln, 1989
Buku Teks SO
Mann, Prem S.
New York John Wiley & Sons 1995,
Buku Teks