K.S.B. Ryholt, The Political Situation in Egypt during the Second Intermediate Period, Carsten Niebuhr Institute Publications, vol. 20. Copenhagen: Museum Tusculanum Press, 1997, excerpts available online.
scribd.com
Thomas Schneider: Ancient Egyptian Chronology - Edited by Erik Hornung, Rolf Krauss, And David a. Warburton, available online, see p. 176
