For more information on excavations at Gordion, see the following: Mary M. Voigt and Robert C. Henrickson, “The Formation of the Phrygian State: The Early Iron Age at Gordion,” Anatolian Studies 50 (2000), pp. 1–18; Voigt and T. Cuyler Young, Jr., “From Phrygian Capital to Achaemenid Entrepöt: Middle and Late Phrygian Gordion,” Iranica Antiqua 34 (1999), pp. 191–241; and Voigt, “Gordion,” Oxford Encyclopedia of Near Eastern Archaeology, ed. Eric M. Meyers (Oxford: Oxford Univ. Press, 1997).