Longman dictionary of English language and culture
Longman, 1992
Buku Referensi
Longman dictionary of contemporary English
Longman, 1989
Buku Referensi
Adam, J.H.
Longman dictionary of business English
York Press, 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