[2019-12-19]. (原始内容存档于2021-04-29). EyeofHorus, Eyeof Ra (Udjat, Wedjat) 互联网档案馆的存檔,存档日期October 12, 2007,. First recorded incidence of the pharmaceutical sign 'Rx'
Maathomeferur. [2009-07-29]. (原始内容存档于2009-03-27). Gae Callender, The EyeOfHorus: A History of Ancient Egypt, Longman Cheshire (1993), p.263 劉文鵬(2008年):《埃及考古學》,331頁,北京:三聯書店