APA Style

Fry, H, 1. (2020). The walls have ears : the greatest intelligence operation of World War II / Helen Fry (1). New Haven: Yale University Press.

MLA Style

Fry, Helen,, 1967-. "The walls have ears : the greatest intelligence operation of World War II / Helen Fry". 1 New Haven: Yale University Press, 2020. หนังสือ (Book).