Dworkin, Ronald
Fontana Press, 1991
Buku Teks
Miles, Kate
Cambridge University Press, 2015
Buku Teks
Coates, Benjamin Allen
Oxford University Press, 2016
eBooks
Griffiths, Percival, Sir, 1899-
Ernest Benn, 1969
Buku Teks
Ohara, Daniel T
Duke University Press, 2003
Buku Teks