See for example seals 22 and 38 pp. 113 and 121 and pl. VI and IX in: Percy Newberry: Scarabs: An introduction to the study of Egyptian seals and signet rings, with forty-four plates and one hundred and sixteen illustrations in the text, 1906, available online copyright-free
K.S.B. Ryholt: The Political Situation in Egypt during the Second Intermediate Period, c. 1800–1550 BC, Carsten Niebuhr Institute Publications, vol. 20. Copenhagen: Museum Tusculanum Press, 1997, excerpts available online here.
H. Gauthier: À propos de certains monuments décrits dans le dernier rapport de M. Pillet, ASAE 24, 1924, p. 196–197, available onlineเก็บถาวร 2014-09-03 ที่ เวย์แบ็กแมชชีน
William C. Hayes: The Scepter of Egypt: A Background for the Study of the Egyptian Antiquities in The Metropolitan Museum of Art. Vol. 1, From the Earliest Times to the End of the Middle Kingdom, MetPublications, 1978, pp. 136–138, available online
William J. Murnane: Ancient Egyptian Coregencies, Studies in Ancient Oriental Civilization (SAOC) 40, Chicago: The Oriental Institute, 1977, available online, direct access to pdf
H. Gauthier: À propos de certains monuments décrits dans le dernier rapport de M. Pillet, ASAE 24, 1924, p. 196–197, available onlineเก็บถาวร 2014-09-03 ที่ เวย์แบ็กแมชชีน