Delage, Christopher (1. juni 2004): , British Archaeological Reports, ISBN 978-1-84171-389-2. Ensminger, M.E.; Parker, R.O. (1986): , 5. utg., Danville, Illinois: The Interstate Printers and Publishers Inc. ISBN 0-8134-2464-X. Krebs, Robert E.; Krebs, Carolyn A. (2003): . Westport, CT: Greenwood Press. ISBN 0-313-31342-3. Price, T. Douglas (2013): , Oxford University Press, ISBN 978-0-19-991470-8. Srejovic, Dragoslav (1972): . ISBN 0-500-39009-6.