R. R. Reeves and others, Dolphins, Porpoises and Whales: 2002-2010 Conservation Action Plan for the World's Cetaceans (Gland, Switzerland: International Union for Conservation of Nature and Natural Resources, 2003), http://www.iucn.org/themes/ssc/actionplans/cetaceans/cetaceans.pdf.
 T. Bettinger and H. Quinn, “Conservation funds: How do zoos and aquaria decide which projects to fund?” in Proceedings of the AZA Annual Conference (St. Louis: AZA, 2000), 52-54.
 T. H. Woodley and others, “A comparison of survival rates for free-ranging bottlenose dolphins (Tursiops truncatus), killer whales (Orcinus orca), and beluga whales (Delphinapterus leucas),” Technical Report No. 97-02 (Guelph: International Marine Mammal Association, Inc., 1997. This report determined that calf mortality in captivity was much higher than in the wild; however, the mortality data from the wild population may have been incomplete. Thus, mortality rates may be similar or, conversely, may be even more divergent than reported.
 L. Rendell and H. Whitehead, “Culture in whales and dolphins”, Behavioral and Brain Sciences 24 (2001): 309-382.
 Krützen and others, “Cultural transmission of tool use in bottlenose dolphins”, Proceedings of the National Academy of Sciences, June 21, 2005, vol. 102, no. 25, 8939-8943.
 See Liu and others, “Comparative studies on the behaviour of Inia geoffrensis and Lipotes vexillifer in artificial environments”, Aquatic Mammals 20 (1994): 35.
 Rees, P., “Will the EC Zoos Directive increase the conservation value of zoo research?”, Oryx 39 (2005): 128-131.
 Mazet and others, “Assessment of the risk of zoonotic disease transmission to marine mammal workers and the public.” Marine Mammal Center survey of the University of California, 2004.