Dowling, Barbara Tolley
Business concepts for English practice
Newbury House Publishers , 1982
 Buku Teks
Voiles, Price R., author
Business English essentials
Glencoe, 1993
 Buku Teks
French, F. G., author
Self-help exercises for practice in English; Book III
Oxford University Press, 1947
 Buku Teks
Thornley, G. C.
Easier scientific English practice / G. C. Thornley
Longman Group Limited, 1970
 Buku Teks
Graver, B.D.
Advanced english practice
Walton Street , 1987
 Buku Teks
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