London, Oxford University Press
Buku Referensi
Palmer, E.H.B., author
W. Foulsham, [1955]
Buku Referensi
Newmark, Maxim, author
New York : Philosophical Library, 1950
Buku Referensi
Houghton Miffiln, 1993
Buku Referensi
Bryson, Bill, author
Penguin Books, 1987
Buku Referensi