Nicholson, Margaret, author
A dictionary of American-English usage, based on Fowler's Modern English usage
Oxford University Press, 1957
 Buku Referensi
The Newbury House dictionary of American English: an essential reference for learners of American English and culture.
Heinle &​ Heinle, 1996
 Buku Referensi
Mastering American English: with recorded exercises for intermediate and advanced students / editor, Grant Taylor
McGraw-Hill, 1956
 Buku Teks
Tilbury, Alex, author
English unlimited : upper intermediate
Cambridge University Press, 2011
 Multimedia
Clementson, Theresa, author
English Unlimited : intermediate
Cambridge University Press, 2011
 Multimedia
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