Richardson, Joanna
The British Council by Longmans, Green, 1960
Buku Teks
essay by Dave Hickey, Peter Plagens
Hudson Hills Press, 1982
Buku Referensi
Walia, Shelley
Jendela, 2003
Buku Teks
Winslow, Ola Elizabeth
Macmillan Company, 1941
Buku Teks
Cambridge University Press, 2010
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