APA (7th ed.) Zitazioa

Cicero, M. T. Treatises on Friendship and Old Age.

Chicago Style (17th ed.) Zitazioa

Cicero, Marcus Tullius. Treatises on Friendship and Old Age.

MLA (9th ed.) Zitazioa

Cicero, Marcus Tullius. Treatises on Friendship and Old Age.