Cita APA (7a ed.)

Alvarez del Vayo, J. (1940). Freedom's battle (First published 1940.). William Heinemann.

Cita Chicago Style (17a ed.)

Alvarez del Vayo, Julio. Freedom's Battle. First published 1940. London: William Heinemann, 1940.

Cita MLA (9a ed.)

Alvarez del Vayo, Julio. Freedom's Battle. First published 1940. William Heinemann, 1940.