Burton, Samuel Holroyd, author
Mastering english language
Macmillan, 1992
 Buku Teks
Samsiah Abdul Hamid, author
Mastering English for employment
Cengage Learning, 2012
 Buku Teks
Gray, Loretta S., author
Mastering idiomatic english
National Textbook Company, 1999
 Buku Teks
Sambrook, G.A., author
English language
Longmans, Green, 1947
 Buku Teks
Bennie, michael, author
Glorier business library : mastering business english
Glorier International, 1999
 Buku Referensi
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