Cita APA (7a ed.)

Shirky, C. (2011). Cognitive surplus: How technology makes consumers into collaborators. Penguin Books.

Cita Chicago Style (17a ed.)

Shirky, Clay. Cognitive Surplus: How Technology Makes Consumers into Collaborators. New York [etc.]: Penguin Books, 2011.

Cita MLA (9a ed.)

Shirky, Clay. Cognitive Surplus: How Technology Makes Consumers into Collaborators. Penguin Books, 2011.