He took verbatim notes of his teacher's lectures, which he subsequently published under the title of The Dissertations (L ta-rpc,6ai), in eight books, of which the first four are extant and constitute the chief authority for Stoic ethics, and The Encheiridion (i.e.
encheiridion הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד