APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.