APA (7th ed.) Citation

Fry, H. (2019). The walls have ears: The greatest intelligence operation of World War II. Yale University Press.

Chicago Style (17th ed.) Citation

Fry, Helen. The Walls Have Ears: The Greatest Intelligence Operation of World War II. New Haven ; London: Yale University Press, 2019.

MLA (9th ed.) Citation

Fry, Helen. The Walls Have Ears: The Greatest Intelligence Operation of World War II. Yale University Press, 2019.