@book{92449,
	author = {Cameron, Adrian Colin and Trivedi, Pravin K.},
	title = {Microeconometrics  methods and applications},
	publisher = {Cambridge University Press},
	year = {2005},
	address = {Cambridge (Inglaterra)},
	url = {http://www.loc.gov/catdir/toc/ecip051/2004022273.html}
}