Jones, Daniel, author
Cambridge english pronouncing dictionary
Cambridge University Press, 2003
 Buku Teks
Webster's new international dictionary of the English language
William Allan Neilson, editor in chief; Thomas A. Knott, general editor; Paul W. Carhart, managing editor
Springfield, G & C Merriam Co.
 Buku Referensi
The Cambridge dictionary of psychology
general editor, David Matsumoto
Cambridge University Press, 2009
 Buku Referensi
Cambridge advanced learner's dictionary
Cambridge University Press, 2005
 Buku Referensi
Peters, Pam, author
The Cambridge guide to English usage
Cambridge University Press, 2006
 Buku Referensi