APA (7th ed.) Citation

Ryan, C. (1967). The longest day: June 6, 1944 (1. print.). Pocket Books.

Chicago Style (17th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. 1. print. New York: Pocket Books, 1967.

MLA (9th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. 1. print. Pocket Books, 1967.