Constantino, Renato, author
Merlin Press, 1978
Buku Teks
Childers, Kristen Stromberg, author
Oxford University Press, 2016
eBooks
edited by Ray Laurence, Joanne Berry
Routledge, 1998
Buku Teks
edited by Anura Goonasekera and Youichi Ito
Pluto Press, 1999
Buku Teks
Council for Research in Values and Philosophy, 2005
Buku Teks