Tham khảo Bell

Tham khảo Bell_XV-3

Chú thích

↑ Maisel et al. 2000, pp. 121-2.
↑ Miller, Jay. Aerophile. San Antonio, Texas, June 1979. Volume 2, Number 1. pages 13–14.

Tài liệu

Markman, Steve, and William G. Holder. Straight Up: A History of Vertical Flight. Schiffer military/aviation history. Atglen, PA: Schiffer Pub, 2000.
Maisel, Martin D., Demo J. Giulianetti and Daniel C. Dugan. "The History of the XV-15 Tilt Rotor Research Aircraft: From Concept to Flight". Washington, D.C.: NASA History Division, 2000.

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