APA Citation

Calkins, C. (1937). Spy overhead: The story of industrial espionage. New York: Harcourt, Brace and Company.

Chicago Style Citation

Calkins, Clinch. Spy Overhead: The Story of Industrial Espionage. New York: Harcourt, Brace and Company, 1937.

MLA Citation

Calkins, Clinch. Spy Overhead: The Story of Industrial Espionage. New York: Harcourt, Brace and Company, 1937.

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