APA (7th ed.) Citation

Whelan, J. R. (1991). Hunters in the sky: Fighter aces of WWII. Regnery Gateway.

Chicago Style (17th ed.) Citation

Whelan, James R. Hunters in the Sky: Fighter Aces of WWII. Washington, D.C.: Regnery Gateway, 1991.

MLA (9th ed.) Citation

Whelan, James R. Hunters in the Sky: Fighter Aces of WWII. Regnery Gateway, 1991.