Charles Brittain, Cicero: On Academic Skepticism (Hackett, 2006), p. 134 online.
Academica Posteriora 1.2: nullam denique artem esse nec dicendi nec disserendi; Barbara Price Wallach, Lucretius and the Diatribe against the Fear of Death: De rerum natura III 830–1094 (Brill, 1976), p. 5, note 10 online.
C.E. Manning, On Seneca's Ad Marciam (Brill, 1981), p. 15, note 21 online.
