Green, George S.
The college hornbook I: a system for sentence structure / by George S. Green.
Holt, Rinehart and Winston, 1972
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Fowler, H. W. (Henry Watson), 1858-1933
A dictionary of modern English usage
Oxford University Press, 1983
 Buku Referensi
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, 1965
 Buku Referensi