APA
Levitt S. D., Dubner S. J., . (2006). Freakonomics : a rogue economist explores the hidden side of everything. London: Penguin.
Chicago
Levitt Steven D, Dubner Stephen J, . 2006. Freakonomics : a rogue economist explores the hidden side of everything. London: Penguin.
Harvard
Levitt S. D., Dubner S. J., . (2006). Freakonomics : a rogue economist explores the hidden side of everything. London: Penguin.
MLA
Levitt Steven D, Dubner Stephen J, . Freakonomics : a rogue economist explores the hidden side of everything. London: Penguin. 2006.