APA (7th ed.) Citation

Ryan, C. (1959). The longest day: June 6, 1944. Simon and Schuster.

Chicago Style (17th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. New York: Simon and Schuster, 1959.

MLA (9th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. Simon and Schuster, 1959.

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