Mills, Paul
Routledge, 2006
Koleksi Publik
Goatly, Andrew
Routledge , 2000
Buku Referensi
Joyce, Helen de Silva
Phoenix Education, 2000
Buku Teks
Routledge in association with the Open University, 2006
Buku Teks
The Open University
Routledge, 2006
Buku Teks