(Ingelesez)Willcox,Michael. (2000).«Soap»Poucher's Perfumes, Cosmetics and Soaps. Hilda Butler,453or.ISBN978-0-7514-0479-1.jatorrizkotikartxibatua (artxibatze data: 2016-08-20) Aipua:«The earliest recorded evidence of the production of soap-like materials dates back to around 2800 BCE in ancient Babylon.».