@book{60918,
	author = {Elster, Jon},
	title = {Explaining social behavior  more nuts and bolts for the social sciences},
	publisher = {Cambridge University Press},
	year = {2007},
	address = {Nueva York (Estados Unidos)},
	url = {http://www.loc.gov/catdir/toc/ecip0616/2006022194.html}
}