See:
- James G. Macqueen, The Hittites: And Their Contemporaries in Asia Minor, rev. eds., London, Thames and Hudson 1986, pp. 67 ff, diff.
- Trevor Bryce, The Routledge Handbook of the Peoples and Places of Ancient Western Asia: From the Early Bronze Age to the Fall of the Persian Empire, Taylor & Francis, 2009, pp. 302-303
