1. American Dental Education Association. History of Dentistry. www.adea.org/GoDental/Health_Professions_Advisors/History_of_Dentistry.aspx.
2. Weinberger BW. An Introduction to the History of Dentistry. 1st ed. St. Louis: The CV Mosby Co.; 1948:22–25.
3. Essam A. The tale of the magnificent Pharaonic Mastaba of Hesy-Ra. www.egypttoday.com/Article/4/53143/The-tale-of-the-magnificent-Pharaonic-mastaba-of-Hesy-Ra.
4. A new era in palaeomicrobiology: prospects for ancient dental calculus as a long-term record of the human oral microbiome