APA (7th ed.) Citation

Petrow, R. (1979). The bitter years: The invasion and occupation of Denmark and Norway, April 1940 - May 1945. Morrow.

Chicago Style (17th ed.) Citation

Petrow, Richard. The Bitter Years: The Invasion and Occupation of Denmark and Norway, April 1940 - May 1945. New York: Morrow, 1979.

MLA (8th ed.) Citation

Petrow, Richard. The Bitter Years: The Invasion and Occupation of Denmark and Norway, April 1940 - May 1945. Morrow, 1979.