New Webster's dictionary of the English language : college edition
Delair Publishing Company, 1981
 Buku Referensi
Halderman, James D., author
Advanced engine performance diagnosis : student cd
2006
 Multimedia
Hewings, Martin, author
Advanced grammar in use : a reference and practice book for advanced students of english
Cambridge University Press, 2005
 Buku Teks
Doff, Adrian, author
English unlimited : C1 Advanced coursebook with e-Portofolio
Cambridge University Press , 2011
 Buku Teks
Hornby, Albert Sydney, author
Oxford advanced learner's dictionary of current English
Oxford University Press, 1977
 Buku Referensi
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