Merck, Melinda D.; Miller, Doris M.; Reisman, Robert W. (2012-01-01). DVM, Melinda D. Merck (ed.). Veterinary Forensics: Animal Cruelty Investigations. John Wiley & Sons, Inc. pp. 207–232. doi:10.1002/9781118704738.ch11. ISBN9781118704738.
Avenson v. Zegart, 577 F. Supp. 958, 960 (United States District Court, D. Minnesota, Sixth Division January 17, 1984) ("A "puppy mill" is a dog breeding operation in which the health of the dogs is disregarded in order to maintain a low overhead and maximize profits.").
United States Department of Agriculture (2003-08-21). "Animal Welfare Act". Archived from the original on 2009-04-16. Retrieved 2007-12-26.
Animal Welfare Information Center – United States Department of Agriculture – Agricultural Research Service – National Agricultural Library (2003-08-21). "Animal Welfare Act and Regulations". Archived from the original on 2009-04-16. Retrieved 2008-01-03.
Animal Welfare Information Center – United States Department of Agriculture – Agricultural Research Service – National Agricultural Library (2003-08-21). "Animal Welfare Act and Regulations". Archived from the original on 2009-04-16. Retrieved 2008-01-03.