Tham khảo Northrop_N-3PB

Ghi chú
    Citations
    1. ↑ O'Leary 1981, p. 28.
    2. ↑ Green 1962, pp. 186–187.
    3. ↑ Bishop 2002, p. 382
    Tài liệu
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    • Bishop, Chris. "The Encyclopedia of Weapons of World War II". New York: Sterling Publishing Company, 2002. ISBN 1-58663-762-2.
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