Kymlicka, Will, author
Oxford University Press, 2007
Buku Teks
Wiarda, Howard J., author
Wardword, 1995
Buku Teks
Epstein, A.L., author
Australian Univ. Press, 1971
Buku Teks
edited by Tinatin Bocorivili; Sweet William; Daniel Ahern
Council for Research in Values and Philosophy, 2005
Buku Teks
edited by Jason L. Finkle and C. Alison McIntosh
Population Council, 1994
Buku Teks