APA (7th ed.) Citation

Churchill, W. S. (1949). Their finest hour. Published in association with the Cooperation Publishing Co. [by] Houghton Mifflin.

Chicago Style (17th ed.) Citation

Churchill, Winston Sir. Their Finest Hour. Boston: Published in association with the Cooperation Publishing Co. [by] Houghton Mifflin, 1949.

MLA (9th ed.) Citation

Churchill, Winston Sir. Their Finest Hour. Published in association with the Cooperation Publishing Co. [by] Houghton Mifflin, 1949.