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WikiPedia: Bá tước xứ Derby http://www.knowsley.com/?p=71 http://www.jjb.uk.com/william/04ferrs.htm https://debretts.com/ https://books.google.com/books?id=2J5rkqos7wAC&pg=... https://archive.org/details/debrettspeeraget00unse... https://web.archive.org/web/20110713163008/http://...