APA (7th ed.) Citation

Walker, M. (2019). Copenhagen revisited. Intellectual collaboration with the Third Reich.

Chicago Style (17th ed.) Citation

Walker, Mark. "Copenhagen Revisited." Intellectual Collaboration with the Third Reich 2019.

MLA (8th ed.) Citation

Walker, Mark. "Copenhagen Revisited." Intellectual Collaboration with the Third Reich, 2019.

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