Theophrastus, On Plants 4.16.6 (see Pliny, Historia naturalis 17.240 for similar advice), as cited by Waldemar Heckel, Who's Who in the Age of Alexander the Great (Blackwell, 2006), p. 289 online.
Gillian Clark, Iamblichus: On the Pythagorean Life (Liverpool University Press, 1989), p. 64, note 145 online.
Waldemar Heckel, Who's Who in the Age of Alexander the Great (Blackwel, 2006), p. 28 online.
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penelope.uchicago.edu
Discussed in the course of Cato the Elder’s effusions on the virtues of cabbage, On Agriculture 157, Bill Thayer’s edition at LacusCurtiusonline.
