Robbins, Lionel, author
Macmillan, 1954
Buku Teks
Brecht, Arnold, author
Princenton University Press, 1968
Buku Teks
Braun, Hans-Joachim
Routledge, 1990
Buku Teks
editor, Cameron Hazlehurst
Australian National University Press, 1979
Buku Teks
edited by Robert Benewick and Philip Green
Routledge , 1992
Buku Teks