APA (7th ed.) Citation

Helen Fry. The Walls Have Ears: The Greatest Intelligence Operation of World War II.

Chicago Style (17th ed.) Citation

Helen Fry. The Walls Have Ears: The Greatest Intelligence Operation of World War II.

MLA (9th ed.) Citation

Helen Fry. The Walls Have Ears: The Greatest Intelligence Operation of World War II.

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