APA (7th ed.) Citation

Leoncini, D. L. P. (1997). On the ethics of friendship. Sophia.

Chicago Style (17th ed.) Citation

Leoncini, Dante Luis P. "On the Ethics of Friendship." Sophia 1997.

MLA (9th ed.) Citation

Leoncini, Dante Luis P. "On the Ethics of Friendship." Sophia, 1997.

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