Levitt, S. D. (2005). Freakonomics: A rouge economist explores the hidden side of everything. Penguin Group.
Lua i Stíl Chicago (17ú heag.)Levitt, Steven D. Freakonomics: A Rouge Economist Explores the Hidden Side of Everything. New York: Penguin Group, 2005.
Lua MLA (9ú heag.)Levitt, Steven D. Freakonomics: A Rouge Economist Explores the Hidden Side of Everything. Penguin Group, 2005.
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