"About the". ASPCA. 1 Januari 1995. Dicapai pada 8 November 2011.
Cruelty to Animals, American Society for the Prevention. "2007 Annual Report"(PDF). Dicapai pada 11 Jun 2009-. Check date values in: |accessdate= (bantuan)
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Cruelty to Animals, American Society for the Prevention. "2007 Annual Report"(PDF). Dicapai pada 11 Jun 2009-. Check date values in: |accessdate= (bantuan)