1. Alpern, Kenneth D. 1983. Aristotle on the friendships of utility and pleasure. Journal of the History of Philosophy 21: 303–315.
2. Annas, Julia. 1977. Plato and Aristotle on friendship and altruism. Mind 86: 532–554.
3. Bryan, Bradley. 2009. Approaching others: Aristotle on friendship’s possibility. Political Theory 37: 754–779.
4. Cooper, John M. 1999. Political animals and civic friendship. In Reason and emotion: Essays on ancient moral psychology and ethical theory, ed. John M. Cooper, 356–377. Princeton: Princeton University Press.
5. Cooper, John M. 1999 [1977a]. Aristotle on the forms of friendship. In Reason and emotion: Essays on ancient moral psychology and ethical theory, ed. John M. Cooper, 312–335. Princeton: Princeton University Press.