Ryan, Thomas: The Moral Priority of Vulnerability and Dependency: Why Social Work Should Respect Both Humans and Animals. In: Animals in Social Work: Why and How They Matter. Hrsg. v. Thomas Ryan. London 2014. Internet: https://www.palgrave.com/us/book/9781137372284. Zuletzt geprüft am: 18.6.2020. S. 80–101.