APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Alvarez del Vayo, Julio. The Last Optimist. New York: Viking Press, 1950.

MLA (9th ed.) Citation

Alvarez del Vayo, Julio. The Last Optimist. Viking Press, 1950.