APA (7th ed.) Citation

Ryan, C. (1960). The longest day: June 6, 1944. Gollancz.

Chicago Style (17th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. London: Gollancz, 1960.

MLA (9th ed.) Citation

Ryan, Cornelius. The Longest Day: June 6, 1944. Gollancz, 1960.

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