(页面存档备份,存于互联网档案馆) Hertha Ayrton's papers in the Royal Society's archives Digitalcopy of the Electric Arc (1902) Project Continua: Biography of Hertha Ayrton
Manila, Philippines: Liberería Manila Filatélica. (Digitalcopy found online at HathiTrust Digital Library on March 31, 2010) https://books.google.com/books
2012-04-24 [2018-07-16]. (原始内容存档于2018-03-09) (美国英语). The Futility of DigitalCopy Prevention (页面存档备份,存于互联网档案馆) Crypto-Gram Newsletter, May 15, 2001 Bruce