Cohen, J.M. (John Michael), 1903-1989, author
Viking, 1993
Buku Referensi
Cassell, 1993
Buku Referensi
Palmer, Alan, author
Penguin Books , 1987
Buku Referensi
edited by Robert Benewick and Philip Green
Routledge , 1992
Buku Teks
edited by Thomas Davidson
W. & R. Chambers, 1901
Buku Referensi