1. American Pet Products Association, 2024. Industry Trends and Stats. 〈https://americanpetproducts.org/industry-trends-and-stats〉
2. American Society for the Prevention of Cruelty to Animals, 2024. Position Statement on Ownership/Guardianship. 〈https://www.aspca.org/about-us/aspca-policy-and-position-statements/position-statement-ownershipguardianship〉 (accessed 2.15.24).
3. American Veterinary Medical Association, 2022. Pet Ownership and Demographic Sourcebook. American Veterinary Medical Association.
4. The reality and evolutionary significance of human psychological sex differences;Archer;Biol. Rev.,2019
5. Preferences for Infant Facial Features in Pet Dogs and Cats;Archer;Ethology,2011