Books on the hellenistic context of the New Testament, primarily on the cynics
Diogenes Laertius, Lives of Eminent Philosophers, R.D. Hicks, Ed. Chapter 2. DIOGENES (404-323 B.C.)
A History Of Cynicism, by Dudley, Donald. R, Publication date 1937
The Cynics : the cynic movement in antiquity and its legacy, R. Bracht Branham, Marie-Odile Goulet-Cazé (ed.), Publication date 1996