APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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