Perrin, Porter G.
Handbook of current English
Glenview, 1968
 Buku Teks SO
The oxford dictionary of current english
Oxford university press , 1992
 Buku Teks
The oxford dictionary of current english
edited by Della Thompson
Oxford University Press, 1996
 Buku Referensi
Hornby, Albert Sydney
Oxford student's dictionary of current English
Oxford University Press, 1984
 Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933
The Concise Oxford Dictionary of Current English
At The Clarendon Press, 1954
 Buku Teks