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
Oxford University Press, 2003
Buku Teks SO
Sage Publications, 2010
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