APA
Levitt S. D., Dubner S. J., . (2009). Super freakonomics They're back. England: Penguin Books.
Chicago
Levitt Steven D, Dubner Stephen J, . 2009. Super freakonomics They're back. England: Penguin Books.
Harvard
Levitt S. D., Dubner S. J., . (2009). Super freakonomics They're back. England: Penguin Books.
MLA
Levitt Steven D, Dubner Stephen J, . Super freakonomics They're back. England: Penguin Books. 2009.