Haigh, Rupert, author
Routledge-Cavendish, 2009
Buku Teks
Peters, Pam, author
Cambridge University Press, 2006
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933, author
Oxford University Press, 1950 ; 1952
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933, author
Oxford University Press, 1965
Buku Referensi
Mager, N. H., author
Prentice-Hall, 1975
Buku Referensi