editor, Cameron Hazlehurst
Australian National University Press, 1979
Buku Teks
edited by Robert Benewick and Philip Green
Routledge , 1992
Buku Teks
Robbins, Lionel
Macmillan, 1954
Buku Teks
Schapiro, J. Salwyn
McGraw-Hill Book Company, Inc., 1950
Buku Teks
Reese, Trevor R.
F.W. Cheshire, 1964
Buku Teks