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 New Lexicon: Webster's dictionary of the English Language
Lexicon Publications , 2004
 Buku Referensi
THe New Lexicon Webster's Dictionary of the English Language Volume 2 (Encyclopedic Edition)
Danbury : Lexicon Publications, Inc., 2004,
 Buku Referensi
Funk and Wagnalls new pratical standard dictionary of the English language editor
New York Funk and Wagnalls Company 1955
 Buku Referensi
THe New Lexicon Webster's Dictionary of the English Language Volume 1(Encyclopedic Edition)
Danbury : Lexicon Publications, Inc., 2004,
 Buku Referensi