بيل اكس في-3

Markman and Holder, 2000

"XV-3, world’s first tiltrotor aircraft returns to Texas A half century after being built in Fort Worth" . Press release from Bell Helicopter. 22 January 2004. Accessed at helis.com on 26 October 2008.

Maisel et al. 2000, p. 17.

Maisel et al., 2000, p. 141.

وفي هذا الصدد، "BELL HELICOPTER TEXTRON XV-3". National Museum of the USAF. Accessed on 26 October 2008.

من جهة ثانية، The Bell XV-15 was flown over Fort Rucker's Nap-of-the-Earth (NOE) flight course from 10–13 September 1984. (Maisel et al., 2000, p. 145.)