Johnsen lhFrederick A. B-17 flying fortress: The symbol of second world war air power.
Chicago Style (17th ed.) CitationJohnsen lhFrederick A. B-17 Flying Fortress: The Symbol of Second World War Air Power. New York lbMcGraw Hill lc2000.
MLA (9th ed.) CitationJohnsen lhFrederick A. B-17 Flying Fortress: The Symbol of Second World War Air Power.
Warning: These citations may not always be 100% accurate.