Bradbrook, Muriel Clara, 1909-1993, author
Cambridge University Press, 1980
Buku Teks
Edwards, Philip, author
British Council by Longmans, Green, 1970
Buku Teks
Canavan, P. Joseph, author
D.C. Health and Company, 1990
Buku Teks
edited, Rebecca Bushnell
Blackwell Publishing, 2005
Buku Teks
Sukarma, K
Sydney IULS-TERC University of New South Wales 1976
Buku Teks