== Henvisninger ==
* Henry Spira. "[http://www.animal-rights-library.com/texts-m/spira01.htm Fighting to Win]". In [[Peter Singer]] (ed), ''In Defense of Animals'', New York: Basil Blackwell, 1985, pp.&nbsp;194–208.
* Peter Singer. ''Ethics Into Action'', Rowman & Littlefield, 1998. (Beskriver meget af Spira's arbejde. Uddrag ka nses online: "[http://utilitarian.net/singer/by/1998----02.htm Ten Ways to Make a Difference] {{Webarchive|url=https://web.archive.org/web/20070425034610/http://www.utilitarian.net/singer/by/1998----02.htm |date=25. april 2007 }}" og "[http://utilitarian.net/singer/by/1998----.htm A Meaningful Life] {{Webarchive|url=https://web.archive.org/web/20070425034358/http://www.utilitarian.net/singer/by/1998----.htm |date=25. april 2007 }}".
Politik