The oxford dictionary of current english
Oxford university press , 1992
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Weiner, E.S.C., compiler
The Oxford guide to English usage
Clarendon Press, 1993
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The Oxford companion to the English language
editor, Tom McArthur ; managing editor, Feri McArthur
Oxford University Press, 1992
 Buku Referensi
CHalker, Sylvia
The Oxford dictionary of English grammar
Clarendon Press, 1994
 Buku Referensi
The Oxford companion to English literature
edited by Margaret Drabble
Oxford University Press, 1985
 Buku Referensi