edited by Patrick M. Malone
Routledge, 1996
Buku Teks SO
Barnett, Jonathan
Westview Press, 1995
Buku Teks SO
edited by Peter Roberts and Hugh Sykes
Sage, 2003
Buku Referensi
edited by Peter Roberts, Hugh Sykes
Sage Publications, 2003
Buku Referensi
McAuslan, Patrick
Gramedia, 1986
Buku Teks SO