edited by Jane Chapman, Marie Kinsey
Routledge, 2009
Buku Teks SO
Orlik, Peter B.
Allyn & Bacon, 1994
Buku Teks SO
Ahmad Zayadi
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2002
UI - Skripsi Membership
Weyland, Paul
American Management Association, 2008
eBooks
edited by Martin P. Brown
IEEE Press, 1981
Buku Teks SO