Elliott, David, author
Routledge, 1997
Buku Teks
Elliott, David, author
Routledge , 1997
Buku Teks
edited by Bob Everett, Godfrey Boyle, Stephen Peake and Janet Ramage
Oxford University Press, 2012
Buku Teks
Coley, David, author
John Wiley & Sons, 2008
Buku Teks
Outhwaite, William, author
Blackwell, 2006
Buku Teks