Hans Ostenfeldt Lange (1863-1943); Maslahat al-Athar; Heinrich Schäfer, (1868-1957) : Catalogue General des Antiquites du Caire: Grab- und Denksteine des Mittleren Reichs im Museum von Kairo, Tafel XXXVIII, (1902) available copyright-free online, see CG 20533 p. 97 of the online reader
Thomas Schneider (2006). "Middle Kingdom and the Second Intermediate Period." In Ancient Egyptian Chronology, edited by Erik Hornung, Rolf Krauss, And David a. Warburton, see p. 187