Θεόφραστος, Περὶ φυτῶν 4.16.6 (βλ. Πλίνιος ο πρεσβύτερος, Φυσική Ιστορία 17.240 για παρόμοια θέματα), as cited by Waldemar Heckel, Who's Who in the Age of Alexander the Great (Blackwell, 2006), σελ. 289 online.
Gillian Clark, Iamblichus: On the Pythagorean Life (Liverpool University Press, 1989), σελ. 64, σημ. 145 online.
uchicago.edu
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.
