Citazione Stile APA (7a Edizione)

Walsh, J. M. (1937). Spies in Spain: The story of a freelance spy. Collins.

Citazione stile Chigago Style (17a edizione)

Walsh, J. M. Spies in Spain: The Story of a Freelance Spy. London: Collins, 1937.

Citatione MLA (8a ed.)

Walsh, J. M. Spies in Spain: The Story of a Freelance Spy. Collins, 1937.