APA (7th ed.) Citation

Ryan. (1987). The longest day: June 6, 1944. Simon and Schuster.

Chicago Style (17th ed.) Citation

Ryan. The Longest Day: June 6, 1944. New York: Simon and Schuster, 1987.

MLA (8th ed.) Citation

Ryan. The Longest Day: June 6, 1944. Simon and Schuster, 1987.

Warning: These citations may not always be 100% accurate.