Giampala, Vincent
John Wiley & Sons,INC, 2004
Buku Teks SO
[publisher not identified], [date of publication not identified]
Naskah
Wolf, Eric R.
Prentice-Hall, 1966
Buku Teks SO
Sutrisno Atmadi
Nuansa Graphis, 2011
Buku Teks
Wiloughby, David A.,
McGraw-Hill, 2002
Buku Teks SO