Cita APA (7a ed.)

Emmatt, s. (2013). 10 Billion. Penguin Books.

Cita Chicago Style (17a ed.)

Emmatt, stephen. 10 Billion. London: Penguin Books, 2013.

Cita MLA (9a ed.)

Emmatt, stephen. 10 Billion. Penguin Books, 2013.