edited by Wei Li and Melissa G. Moyer
Blackwell, 2008
Buku Teks
edited by Tej K. Bhatia and William C. Ritchie
Wiley Blackwell, 2014
Buku Teks
Baker, Colin, author
Multilingual Matters Ltd., 1995
Buku Referensi
edited by Janet Holmes and Kirk Hazen
John Wiley & Sons, 2014
Buku Teks
Banister, Peter, author
Open University Press, 1994
Buku Teks