"Apprentices' Column". The Builder and Wood-Worker. Vol. 20. New York: Fred A. Hodgson. Aug 1884. p. 157. Archived from the original on 2023-01-02. Retrieved 2016-12-11.
Isler, Martin (1983). "Concerning the Concave Faces on the Great Pyramid". Journal of the American Research Center in Egypt. 20: 27–32. doi:10.2307/40000899. JSTOR40000899.
Isler, Martin (1983). "Concerning the Concave Faces on the Great Pyramid". Journal of the American Research Center in Egypt. 20: 27–32. doi:10.2307/40000899. JSTOR40000899.
"Apprentices' Column". The Builder and Wood-Worker. Vol. 20. New York: Fred A. Hodgson. Aug 1884. p. 157. Archived from the original on 2023-01-02. Retrieved 2016-12-11.