The Lectures of Musonius Rufus
The Hymn to Zeus by Cleanthes, and other early fragments(Zeno, Cleanthes, Chrysippus, Aristo, Posidonius, Panaetius)
On Ends by Cicero (De Finibus)
Tusculan Disputations by Cicero
On the Heavens by Cleomedes
Arius Didymus: Epitome of Stoic Ethics