Biddle, W. (1991). Barons of the sky. New York: Simon & Schuster.
Trích dẫn kiểu ChicagoBiddle, Wayne. Barons of the Sky. New York: Simon & Schuster, 1991.
MLA引文Biddle, Wayne. Barons of the Sky. New York: Simon & Schuster, 1991.
警告：這些引文格式不一定是100％准確.