Plutarch, Crassus, 9:1–3; Frontinus, Stratagems, Book I, 5:20–22; Appian, Civil Wars, 1:116; Broughton, Magistrates of the Roman Republic, p. 109. Note: Plutarch and Frontinus write of expeditions under the command of "Clodius the praetor" and "Publius Varinus", while Appian writes of "Varinius Glaber" and "Publius Valerius".