Cita APA (7th ed.)

Alvarez del Vayo, J. (1950). The last optimist. Putnam.

Cita Chicago (17th ed.)

Alvarez del Vayo, J. The Last Optimist. London: Putnam, 1950.

Cita MLA (8th ed.)

Alvarez del Vayo, J. The Last Optimist. Putnam, 1950.