Robin Seager, "Sulla," in The Cambridge Ancient History (Cambridge University Press, 1994), vol. 9, p. 181 online.
Arthur Keaveney, Sulla, the Last Republican (Routledge, 2nd edition 2005), p. 77 online.
John G.F. Hind, "Mithridates," in The Cambridge Ancient History (Cambridge University Press, 2nd edition 1994), vol. 9, p. 160 online.
Mary Taliaferro Boatwright, Daniel J. Gargola, Richard J. A. Talbert, The Romans: From Village to Empire (Oxford University Press, 2004), p. 188 online.
Liv Mariah Yarrow, Historiography at the End of the Republic: Provincial Perspectives on Roman Rule (Oxford University Press, 2006), p. 246 online.
Bobbio Scholiast 96.3 (Stangl 11), Cicero, Pro Flacco 63 and 100; Christoph F. Konrad, Plutarch's Sertorius: A Historical Commentary (University of North Carolina Press, 1994), p. 85–86 online.