Tham khảo Mitsubishi_Ki-21

    • Francillon, René J. The Mitsubishi Ki-21 (Aircraft in Profile number 172). Leatherhead, Surrey, UK: Profile Publications Ltd., 1967.
    • _______________Japanese Aircraft of the Pacific War. London, Putnam & Company Ltd., 1970. second edition 1979. ISBN 0-370-30251-6.
    • Mondey, David. The Concise Guide to Axis Aircraft of World War II. ISBN 1-85152-966-7
    • Gunston, Bill. The Illustrated Directory of Fighting Aircraft of World War II. ISBN 0-86101-390-5