The Macquarie dictionary
The Macquarie Library, 1996
 Buku Referensi
University of chicago spanish dictionary
compiled by Carlos Castillo & Otto F. Bond
The University of Chicago Press, 1948
 Buku Referensi
Australian spelling dictionary
editor, Bud Wileman, Robin Wileman, Bessana C. Sewell
Wileman Publications, 1986
 Buku Referensi
Longman dictionary of contemporary English
Longman, 1989
 Buku Referensi
Heaton, J.B., author
Longman dictionary of common errors
Longman, 1987
 Buku Referensi
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