1. American Pet Products Association. Available from: https://www.americanpetproducts.org/press_industrytrends.asp
2. Statista Research Department. Available from: https://www.statista.com/statistics/250851/basic-annual-expenses-for-dog-and-cat-owners-in-the-us/
3. US Drug and Food Administration. The Federal Food, Drug, and Cosmetic Act. Available from: https://www.fda.gov/animal-veterinary/animal-food-feeds/pet-food
4. National Archives and Record Administration. Title 21 code of federal regulations, part 113 (21 CFR 113). Available from: https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-113
5. Kitten nutrition