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Kuperard, 2006
Buku Referensi
Noor Aini binti Datuk Abdullah, author
Mardshall Cavendish, 2010
Buku Teks
Ward, Colleen A., author
Routledge, 2003
Buku Teks
Bowey, Angela
Macmillan, 1974
Buku Teks
Chew, Sally
Times Books International, 1995
Buku Teks