↑Wilkinson, Toby (2010). "Timeline". The Rise and Fall of Ancient Egypt. New York: Random House. p. xiii. ISBN9781408810026. The system of dynasties devised in the third century B.C. is not without its problems—for example, the Seventh Dynasty is now recognized as being wholly spurious, while several dynasties are known to have ruled concurrently in different parts of Egypt...
↑Redford, Donald B., ed. (2001). "Egyptian King List". The Oxford Encyclopedia of Ancient Egypt, Volume 2. Oxford University Press. pp. 626–628. ISBN978-0-19-510234-5.
↑Shaw, Ian, ed. (2000). The Oxford History of Ancient Egypt. Oxford University Press. p. 480. ISBN0-19-815034-2.
↑Peter Clayton: Chronicle of the Pharaohs, Thames & Hudson Ltd, second printing edition 1994, ISBN978-0500050743, available online, see p. 70
