Charles, Curtis B.
John Wiley & Sons, 1996
Buku Teks SO
Chapman, Nigel
John Wiley & Sons, 2009
Buku Teks SO
Andleigh, Prabhat K.
Prentice-Hall, 1996
Buku Teks SO
Cawkell, Tony
Routledge, 1996
Buku Referensi
edited by Henk M. Blanken ... [and others]
Springer, 2007
Buku Teks SO