MLA

Shirky, Clay. Cognitive Surplus : How Technology Makes Consumers Into Collaborators. London: Penguin, 2010.

APA

Shirky, C. (2010). Cognitive surplus : how technology makes consumers into collaborators. London: Penguin.

Chicago

Shirky, Clay, Cognitive Surplus: How Technology Makes Consumers Into Collaborators. London: Penguin, 2010.