Thody, Philip
Routledge , 1997
Buku Teks SO
Phinnemore, David
Routledge, Taylor & Francis Group, 2008
Buku Referensi
Oxford University Press, 2003
Buku Teks SO
Sage Publications, 2010
eBooks
Chryssochoou, Dimitris N.
I.B. Tauris Publishers, 2000
Buku Teks SO