1. AHA (American Humane Association) (2014)
http://www.americanhumane.org/animals/programs/no-animals-were-harmed/
. Accessed 1 Apr 2014
2. Amboseli Trust for Elephants (2008) Statement on circus elephants.
http://www.elephanttrust.org/article/1
March. Accessed 3 Apr 2014
3. Animal Defenders International (1998) The ugliest show on earth. Animal Defenders International, London
4. Animal Defenders International (2001) Animal circuses – time for a ban. Parliamentary briefing. Animal Defenders International, London
5. Animal Defenders International (2006) Animals in travelling circuses: the science on suffering. Animal Defenders International, London