The relationship with the Persians is described in Kagan, Donald (2003). The Peloponnesian War. New York: Viking (The Penguin Group). pp. 468–471. ISBN9780670032112..
Plutarch; W.C.Helmbold. "De Garrulitate". Perseus Digital Library. Tufts University. Retrieved 5 May 2021. ἂν ἐμβάλω εἰς τὴν Λακωνικήν, ἀναστάτους ὑμᾶς ποιήσω
Plutarch 1874, De garrulitate, 17. Plutarch (1874), Plutarch's Morals, Translated from the Greek by several hands. Corrected and revised by. William W. Goodwin, PH. D., Boston, Cambridge{{citation}}: CS1 maint: location missing publisher (link)
Plutarch 1891, De garrulitate, 17; in Greek. Plutarch (1891), Bernardakis, Gregorius N. (ed.), Moralia, Plutarch (in Greek), Leipzig: Teubner