William Addis (entrepreneur) - Wikipedia
A Visual History of the Toothbrush | Museum of Every Day Life
你知道“现代牙刷之父”William Addis吗? - 知乎专栏
Who invented the toothbrush and when was it invented?
Who invented the toothbrush? - HISTORY
William Edward Addis Inventor of Toothbrush - Researchpedia
Who Made That Toothbrush? - The New York Times
William Addis 1780 - Made up in Britain: Toothbrush
Made up in Britain: Toothbrush : William Addis 1780
William Addis (entrepreneur) facts for kids - Kids encyclopedia