APA (7th ed.) Citation

Shirky, C. (2011). Cognitive surplus: Creativity and generosity in a connected age (1. publ. in Penguin Books.). Penguin Books.

Chicago Style (17th ed.) Citation

Shirky, Clay. Cognitive Surplus: Creativity and Generosity in a Connected Age. 1. publ. in Penguin Books. London [u.a.]: Penguin Books, 2011.

MLA (9th ed.) Citation

Shirky, Clay. Cognitive Surplus: Creativity and Generosity in a Connected Age. 1. publ. in Penguin Books. Penguin Books, 2011.