On Virtues and Vices (Greek: Περὶ Ἀρετῶν καὶ Κακιῶν; Latin: De Virtutibus et Vitiis Libellus) is a short ethical treatise once thought to be by Aristotle, but now more usually thought to be the work of a later follower.
Free online texts
Internet Archive: The Works of Aristotle - Magna Moralia, Ethica Eudemia, De Virtutibus Et Vitiis. English translations, edited by W.D. Ross. Multiple formats.
Loebulus. L285 - Aristotle -- Athenian Constitution. Eudemian Ethics. Virtues and Vices. PDF of public domain Loeb edition in Greek and English.
Wikisource: Περί Αρετών και Κακιών - Greek text. Multiple formats.
Wikipedia: On Virtues and Vices.
The Great Conversation: Further reading at Tom's Learning Notes
Aristotle: The Nicomachean Ethics.
Aristotle: The Eudemian Ethics.
Aristotle (attributed): The Magna Moralia.
Theophrastus: The Characters.
Ancient Greek resources: Learn to read Greek classics in the original.