Longman dictionary of the English language
Longman, 1984
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Longman dictionary of contemporary English
Longman, 1989
 Buku Referensi
Longman dictionary contemporary English
chief editor, Paul Procter
Longman, 1982
 Buku Referensi
Longman Dictionary of Contemporary English
Pearson Longman, 2006
 Buku Referensi
Longman dictionary of English language and culture
Longman, 1992
 Buku Referensi