THe New Lexicon Webster's Dictionary of the English Language Volume 1(Encyclopedic Edition)
Danbury : Lexicon Publications, Inc., 2004,
 Buku Referensi
THe New Lexicon Webster's Dictionary of the English Language Volume 2 (Encyclopedic Edition)
Danbury : Lexicon Publications, Inc., 2004,
 Buku Referensi
Webster's new world dictionary of the American language : encyclopedic edition : volume I
The World Publishing Co., 1951
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Webster's new world dictionary of the American language : encyclopedic edition : volume II
The World Publishing Co., 1951
 Buku Referensi
IRAL: International Review of Applied Linguistics in Language Teaching
Julius Groos Verlag, {s.a}
 Majalah, Jurnal, Buletin