McKenzie, Richard B.
McGraw-Hill, 1978
Buku Teks
Palmer, Monte
Thomson, 2006
Buku Teks
edited by Garry Rodan, Kevin Hewison and Richard Robison
Oxford University Press, 1997
Buku Teks
Norcliffe, Glen
Routledge, 2015
Buku Teks
Frohlich, Norman
Prentice-Hall, 1987
Buku Teks