APA (7th ed.) Citation

Agar, H. (1973). The darkest year: Britain alone. June 1940- june 1941. Doubleday.

Chicago Style (17th ed.) Citation

Agar, Herbert. The Darkest Year: Britain Alone. June 1940- June 1941. Garden City, N.Y: Doubleday, 1973.

MLA (9th ed.) Citation

Agar, Herbert. The Darkest Year: Britain Alone. June 1940- June 1941. Doubleday, 1973.

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