Gaya APA

Levitt, S, D., Dubner, S, J. (2009). Freakonomics : A Rogue Economist Explores the Hidden Side of Everything (Ed. 1). New York: Harper & Row, Publisher.

Gaya MLA

Levitt, Steven, D.., Dubner, Stephen, J. "Freakonomics : A Rogue Economist Explores the Hidden Side of Everything". Ed. 1 New York: Harper & Row, Publisher, 2009. Text.