Gaya APA

Havens, J, C. (2015). Hacking Happiness: Why Your Personal Data Counts and How Tracking It Can Change the World . New York: Jeremy P. Tarcher/Penguin.

Gaya MLA

Havens, John, C.. "Hacking Happiness: Why Your Personal Data Counts and How Tracking It Can Change the World". New York: Jeremy P. Tarcher/Penguin, 2015. Text.