John Wiley & Sons, 2005
Buku Teks SO
edited by Robert A. Brown and Joan Roberts Field
PMA Publishing, 1988
Buku Teks SO
Ann Vernon, editor
Springer, 2012
Buku Teks SO
Ann Vernon, editor
[Springer, ], 2012
eBooks
McMahon, Linnet
Routledge, 1992
Buku Referensi