Merriam-Webster, 2000
Buku Referensi
Merriam-Webster, Incorporated, 1996
Multimedia
Delair Publishing Company, 1981
Buku Referensi
Bolander, Donald O., author
Lexicon, 1993
Buku Referensi
David B. Guralnik, general editor
The World Publishing Co., 1956
Buku Referensi