Daltrop, Anne
Longman, 1982
Buku Teks SO
edited by Susan Baker ... [et al.]
Routledge, 1997
Buku Teks SO
edited by Stephen White, Judy Batt and Paul G. Lewiss
Macmillan, 1993
Buku Teks SO
Nugent, Neill
Macmillan, 1994
Buku Teks
Oxford University Press, 2003
Buku Teks SO