[4] [4] Kendall F. Next generation air dominance (NGAD), memorandum[Z]. The US Bloombery News Network, 2012.

[5] [5] Tirpak J A. The sixth generation fighter[J]. Air Force Magazine, 2009(10): 38-42.

[7] [7] Adam J Hebert. Fighter generations[J]. Air Force, 2008(9).

[8] [8] John A Tirpak. The sixth generation fighter[J]. Air Force, 2009(10).

[10] [10] Sustaining U.S. Global leadership: priorities for 21st century defense. Department of Defense, 2012.

[14] [14] National Research Council. A review of United States air force and department of defense aerospace propulsion needs[R]. ISBN 0-309-66243-5.