Book 36, chapter 17, in The Natural History of Pliny, translated by John Bostock và Henry Thomas Riley, Volume 6, pages 336-337 (London: H. G. Bohn, 1857).[2]
Coxill, David (1998). "The Riddle of the Sphinx", InScription: Journal of Ancient Egypt, 2 (Spring 1998), 17; cited in Schoch, Robert M. (2000) [1]. "New Studies Confirm Very Old Sphinx" in Dowell, Colette M. (ed). Circular Times.
