Corder, Jim W.
Handbook of current english
Scott, Foresman and Company, 1981
 Buku Referensi
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
Fowler, H. W. (Henry Watson), 1858-1933
The Concise Oxford Dictionary of Current English
At The Clarendon Press, 1954
 Buku Teks
Hornby, Albert Sydney
The advanced learner's dictionary of current english
Oxford University Press , 1963
 Buku Teks