Donald, Graeme
Simon & Schuster, 1994
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933
Oxford University Press, 1983
Buku Referensi
Cohen, J.M. (John Michael), 1903-1989
Penguin Books, 1971
Buku Referensi
Cohen, J.M. (John Michael), 1903-1989
Allen Lane, 1980
Buku Referensi
Garner, Bryan A.
Oxford University Press, 1995
Buku Referensi