Peters, Pam
Cambridge University Press, 2006
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933
Oxford University Press, 1950 ; 1952
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933
Oxford University Press, 1965
Buku Referensi
Mager, N. H.
Prentice-Hall, 1975
Buku Referensi
Evans, Desmond W.
Pitman, 1989
Buku Teks