Vitae philosophorum, libri X (excerpt: book 7)
(engl.: Diogenes Laėrtius, The Lives and Opinions of Eminent Philosophers, C.D. Yonge, G. Bell & Sons, London 1895)
at Ancient History Sourcebook
[www.fordham.edu/halsall/ancient/diogeneslaertius-book7-stoics.html]