Ramsden, Paul
Routledge , 1992
Buku Teks
Brown, George
Routledge, 1997
Buku Teks
edited by Michael Byram
Multilingual Matters, 1994
Buku Teks SO
edited by Heather Fry, Steve Ketteridge and Stephanie Marshall
Routledge, 2009
Buku Referensi
edited by David McNamara, Robert Harris
Routledge, 1997
Buku Teks