Robin Seager, "Sulla," in The Cambridge Ancient History (Cambridge University Press, 1994), 2nd ed., vol. 9, p. 181 online.
Francis X. Ryan, Rank and Participation in the Roman Senate (Franz Steiner Verlag, 1998), p. 191 online and p. 194.
Lovano, The Age of Cinna, p. 81; Christoph F. Konrad, Plutarch's Sertorius: A Historical Commentary (University of North Carolina Press, 1994), p. 86 online.
Lovano, The Age of Cinna, pp. 105–113, limited preview online.
Cicero, Ad Atticum 9.15.2, Leges Agrariae 3.5, Pro Sexto Roscio Amerino 125; Appian, Bellum civile 1.98; Erik Hildinger, Swords Against the Senate: The Rise of the Roman Army and the Fall of the Republic (Da Capo Press, 2002), p. 209 online.
H.H. Scullard, From the Gracchi to Nero: A History of Rome from 133 B.C. to A.D. 68 (Routledge, 1988), p. 79 online.
