MacIssac, David; Morrison, Wilbur H.; and Copp, DeWitt S.
""Fortress without a Roof: The Allied Bombing of the Third Reich," and "Forged in Fire: Strategy and Decisions in the Air War over Europe, 1940-45","
Naval War College Review: Vol. 36
, Article 13.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol36/iss4/13