Gaya APA

Levitt, S, D., Dubner, S, J. (2009). Freakonomics : A Rogue Economist Explores The Hidden Side Of Everything (Cet. 1). New York: Harper Collins Publisher.

Gaya MLA

Levitt, Steven, D.., Dubner, Stephen, J.. "Freakonomics : A Rogue Economist Explores The Hidden Side Of Everything". Cet. 1 New York: Harper Collins Publisher, 2009. TEXT.