Johns, Dean.
Strategic Information and Research Development Centre, 2011
Buku Teks SO
Johns, Dean
Strategic Information and Research Development Centre , 2010
Buku Teks SO
edited by R. Narayanan
Applied Science, c1983
Buku Teks SO
Adams, Jonathan
Academic Edition, 1998
Buku Teks SO
Ozn, Klaas de Jong
J.H. Kok, 1989
Buku Teks