Kamrava, Mehran
Routledge , 2000
Buku Teks SO
Artikel Jurnal
edited by Frances Stewart, Ruhi Saith, Barbara Harriss-White
Palgrave Macmillan, 2007
Buku Teks
edited by John Pickford
Grosvenor Press International, 1987
Buku Teks
Morley, David, 1964-
Butterworth, 1975
Buku Teks