Delair , 1981
Buku Teks
Merriam-Webster,
Buku Referensi
Macmillan, 1996
Buku Referensi
compiled by the editors of Webster's New World Dictionaries ; Michael Agnes, editor in chief ; with principal thesaurus text by Charlton Laird
Houghton Mifflin Harcourt, 2013
Buku Referensi
Ochs, Linnea Leedham, author
Prentice-Hall, 1987
Buku Referensi