^Wilkinson, Toby. Royal Annals of Ancient Egypt: The Palermo Stone and Its Associated Fragments, p79. Kegan Paul International, 2000.
^Wilkinson, Toby. Royal Annals of Ancient Egypt: The Palermo Stone and Its Associated Fragments, p79-80. Kegan Paul International, 2000.
^Clayton, Peter A. Chronicle of the Pharaohsp.32 Thames and Hudson, 2004. ISBN 978-0-500-28628-9
^Jaromir Malek 'The Old Kingdom' in The Oxford History of Ancient Egypt by Ian Shaw(ed.)Oxford University Press. paperback 2002. p.92
^Alessandro Bongioanni & Maria Croce(ed.), The Treasures of Ancient Egypt: From the Egyptian Museum in Cairo, Universe Publishing, a division of Ruzzoli Publications Inc., 2003. p.344