Cita APA (7a ed.)

Pinker, S. (2012). The better angels of our nature: Why violence has declined. Penguin Books.

Cita Chicago Style (17a ed.)

Pinker, Steven. The Better Angels of Our Nature: Why Violence Has Declined. London: Penguin Books, 2012.

Cita MLA (9a ed.)

Pinker, Steven. The Better Angels of Our Nature: Why Violence Has Declined. Penguin Books, 2012.