Rush, Michael
Harvester Wheatsheaf, 1992
Buku Teks
Cambridge University Press, 2020
eBooks
Archibald, W. Peter (William Peter), 1943-
McGraw-Hill Ryerson, 1978
Buku Teks
Tugba Basaran, Didier Bigo, Emmanuel-Pierre Guittet and R.B.J Walker.
Routledge, 2017
Buku Teks
Keane, John
Cambridge University Press, 2018
eBooks