Flags at Sea: A Guide to the Flags Flown at Sea by British and Some Foreign Ships, from the 16th Century to the Present Day, Illustrated from the Collections of the National Maritime Museum.
Graham Bartram: British Flags and Emblems, 2004 Tim Wilson: Flags at Sea: A guide to the flags flown at sea by British and some foreign ships, from the 16th century to the present day, illustrated from the collections of the National Maritime Museum, 1999