Evans, Desmond W.
Improving english skills
Pitman, 1989
 Buku Teks SO
Peters, Pam
The Cambridge guide to English usage
Cambridge University Press, 2006
 Buku Referensi
Fowler, H.W. [Henry Watson], 1858-1933
A dictionary of modern English usage
Oxford University Press, 1950 ; 1952
 Buku Referensi
Fowler, H.W. [Henry Watson], 1858-1933
A dictionary of modern English usage
Oxford University Press, 1983
 Buku Referensi
Fowler, H.W. [Henry Watson], 1858-1933
A dictionary of modern English usage
Oxford University Press, 1965
 Buku Referensi