Cita APA (7th ed.)

Harrington, M. (1990). Socialism: Past and future. Penguin Books.

Cita Chicago (17th ed.)

Harrington, Michael. Socialism: Past and Future. New York: Penguin Books, 1990.

Cita MLA (9th ed.)

Harrington, Michael. Socialism: Past and Future. Penguin Books, 1990.