Cita APA (7a ed.)

Cicero, M. T., & Freeman, P. (2018). How to Be a Friend: An Ancient Guide to True Friendship. Princeton University Press.

Cita Chicago Style (17a ed.)

Cicero, Marcus Tullius, y Philip Freeman. How to Be a Friend: An Ancient Guide to True Friendship. Princeton: Princeton University Press, 2018.

Cita MLA (8a ed.)

Cicero, Marcus Tullius, y Philip Freeman. How to Be a Friend: An Ancient Guide to True Friendship. Princeton University Press, 2018.