1. APPA 2014. Pet Industry Market Size & Ownership Statistics: Estimated 2014 Sales within the U.S. Markethttp://www.americanpetproducts.org/press_industrytrends.asp
2. Transparency Market Research 2014. Global Pet Food Market to be Worth US $74.8 Billion by 2017http://www.transparencymarketresearch.com/pressrelease/pet-food-market.htm
3. Good taste: Petfood palatability update 2014;Taylor;Petfood Ind.,2014
4. The Business of Pet Foodhttp://petfood.aafco.org/caloriecontent.aspx
5. Taste perception and discrimination by the dog;Kitchell;Adv. Vet. Sci. Comp. Med.,1978