Very little has survived from the Stoa. Collections of texts include

Stoicorum Veterum Fragmenta [SVF]

Fragmentsammlungen are nice and immenseful helpful. Yet to do serious work one has to confront the original texts themselves. A few of the more indispensable ones will be gathered below.

Commentaria in Aristotelem Graeca [CAG]
Between 1883 and 1909 the Berlin Academy edited some 15,000 pages of commentaries on Aristotle in Greek, dating from the second to the thirteenth century ad. In many cases, these editions are still the best we have. They are being translated in the Ancient Commentators on Aristotle Project, under the editorship of Richard Sorabji.—To begin with, the Commentator: