• Animal Underworld: Inside America's Black Market for Rare and Exotic Species by Alan Green
  http://www.amazon.com/Animal-Underworld-Inside-Americas-Species/dp/1586483749
   

• Against Zoos by Dale Jamieson
  http://www.animal-rights-library.com/texts-m/jamieson01.htm
   

• Association of Zoos & Aquariums
  https://www.aza.org/

• Liberation BC
  http://liberationbc.org/issues/zoos
   

• Zoo Facts - Humane Society
  http://www.humanesociety.org/issues/zoos/facts/zoos.html#.U2KtnVVdWf4
   

• Morality's Progress: Essays on Humans, Other Animals, and the Rest of Nature
  http://as.nyu.edu/docs/IO/1192/Against_Zoos.pdf

• Inside The National Zoo Deaths
  http://www.washingtonpost.com/wp-srv/metro/daily/graphics/zoo_120703.htm

• Born Free USA
  http://www.bornfreeusa.org/a1a2_circus.php

• Barren Cages, Empty Lives by the World Society for the Protection of Animals (WSPA)
  http://www.wspa.ca/Images/barren%20cages_tcm22-8303.pdf
   

• SURPLUS ANIMALS: THE CYCLE OF HELL A Study of Captive Wildlife in the United States
  http://www.pawsweb.org/surplus.pdf

Resources and Further Learning