Gaya APA

Levitt, S, D., Dubner, S, J. (2009). Freakonomics : A Rogue economist explores the ridden side of everithings . New York: Harper Collins College Publisher.

Gaya MLA

Levitt, Steven, D.., Dubner, Stephen, J.. "Freakonomics : A Rogue economist explores the ridden side of everithings". New York: Harper Collins College Publisher, 2009. Text.