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Sources:

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• "Gadget with more byte than bark." BBC News. Aug. 8, 2001. (March 14, 2008)
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• "Principles of Organizable Behavior 4e: Glossary." Oxford University Press. (March 14, 2008)
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• Cleland, Gary. "Owners give Prozac to depressed pets." Telegraph. Feb. 26, 2008. (March 14, 2008)
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