@book{1981,
	author = {Krugman, Paul and Obstfeld, Maurice},
	title = {Economía internacional :},
	publisher = {Pearson,},
	year = {D.L. 2012.},
	address = {[Madrid] :},
	edition = {9ª ed.},
	url = {https://isae.metabiblioteca.org/cgi-bin/koha/opac-retrieve-file.pl?id=856812eb2336ea2a84938d869e21e5b8}
}