McCarthy, Michael, author
English vocabulary in use : upper-intermediate & advanced
Erlangga, 2002
 Buku Teks
DeTienne, Kristen Bell, author
Guide to electronic communication : using technology for effective business writing and speaking
Prentice-Hall, 2002
 Buku Teks
Azar, Betty Schrampfer, 1941-, author
Understanding and using English grammar
Prentice Hall Regents, 1989
 Buku Referensi
Azar, Betty Schrampfer, 1941-, author
Understanding and using english grammer / Betty Schrampfer Azar
Longman, 2002
 Buku Teks
Azar, Betty Schrampfer, 1941-, author
Understanding and using english grammer
Pearson Education, 2009
 Buku Teks
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