^The Cambridge Ancient History, Volume 6: The Fourth Century BC by D. M. Lewis (Editor), John Boardman (Editor), Simon Hornblower (Editor), M. Ostwald (Editor), ISBN0-521-23348-8, 1994, page 423, "Through contact with their Greek neighbors some Illyrian tribe became bilingual (Strabo Vii.7.8.Diglottoi) in particular the Bylliones and the Taulantian tribes close to Epidamnus..."