Birkett, Julian, author
A & C Black, 1993
Buku Teks
Joyce, Helen de Silva, author
Phoenix Education, 2000
Buku Teks
Mills, Paul, author
Routledge, 2006
Buku Teks
Routledge in association with the Open University, 2006
Buku Teks
The Open University
Routledge, 2006
Buku Teks