Peck, Harry Thurston (1898). "Harpers Dictionary of Classical Antiquities". www.perseus.tufts.edu. Harper and Brothers. Retrieved 2021-11-14. https://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0062:entry=pythius-harpers
[G.P. Goold, ed. Herodotus, vol. 3. The Loeb Classical Library, 1922. Note to p. 351.]
Morrison, A. D. (2020-01-30). Apollonius Rhodius, Herodotus and Historiography. Cambridge University Press. ISBN 978-1-108-49232-4. 978-1-108-49232-4
Peck, Harry Thurston (1898). "Harpers Dictionary of Classical Antiquities". www.perseus.tufts.edu. Harper and Brothers. Retrieved 2021-11-14. https://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0062:entry=pythius-harpers
Dijn, Annelien De (2020). Freedom: An Unruly History. Harvard University Press. ISBN 978-0-674-98833-0. 978-0-674-98833-0
Abbott, Jacob (2019-09-25). Xerxes. BoD – Books on Demand. ISBN 978-3-7340-7152-2. 978-3-7340-7152-2
Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898), Pythius https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0062%3Aalphabetic+letter%3DP%3Aentry+group%3D27%3Aentry%3Dpythius-harpers
Dijn, Annelien De (2020). Freedom: An Unruly History. Harvard University Press. ISBN 978-0-674-98833-0. 978-0-674-98833-0
Hanson, Victor Davis (2007-12-18). Carnage and Culture: Landmark Battles in the Rise to Western Power. Knopf Doubleday Publishing Group. ISBN 978-0-307-42518-8. 978-0-307-42518-8