1. AAFP. (2007). Confinement of owned indoor cats. American Association of Feline Practitioners (AAFP). http://www.catvets.com/guidelines/position-statements/confinement-indoor-cats
2. AAFP. (2011). Environment enhancement of indoor cats position statement. American Association of Feline Practitioners (AAFP). http://www.catvets.com/guidelines/position-statements/confinement-indoor-cats
3. A Defense of Free-Roaming Cats from a Hedonist Account of Feline Well-being
4. Guardians' Knowledge and Husbandry Practices of Feline Environmental Enrichment
5. AVMA. (n.d.). Free-roaming owned cats. American Veterinary Medicine Association (AVMA). https://www.avma.org/resources-tools/avma-policies/free-roaming-owned-cats