ケルン爆撃
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Bishop, Chris (2005), The Military Atlas of World War II, Amber Books, p. 30, ISBN 1-904687-43-1
“Bomber Command Campaign Diary”, Royal Air Force Bomber Command 60th Anniversary (RAF), (6 April 2005), オリジナルの6 July 2007時点におけるアーカイブ。, http://webarchive.nationalarchives.gov.uk/20070706011932/http://www.raf.mod.uk/bombercommand/diary.html