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«Octopus enrichment program». Smithsonian National Zoological Park. Archivado desde el original el 14 de junio de 2006. Consultado el 11 de junio de 2006.
Hurme, K., Gonzalez, K., Halvorsen, M., Foster, B., Moore, D. and Chepko-Sade, D., (2003). Environmental enrichment for Dendrobatid frogs. Journal of Applied Animal Welfare Science, 6: 285–299 [1]Archivado el 3 de diciembre de 2013 en Wayback Machine.
«Octopus enrichment program». Smithsonian National Zoological Park. Archivado desde el original el 14 de junio de 2006. Consultado el 11 de junio de 2006.
Hubrecht, R. (1995). Dogs and dog housing. In, Smith, C.P. and V. Taylor (Eds) Environmental Enrichment Information Resources for Laboratory Animals. Universities Federation for Animal Welfare (UFAW), Potters Bar, Herts. pp. 49-62 [3]