Willcox, Michael. Soap. Hilda Butler (编). Poucher's Perfumes, Cosmetics and Soaps 10th edition. Dordrecht: Kluwer Academic Publishers. 2000: 453. The earliest recorded evidence of the production of soap-like materials dates back to around 2800 BCE in Ancient Babylon. 引文格式1维护:冗余文本 (link)