@book{90280,
	author = {Alvarez de Ulloa, Leonor},
	title = {Cangrejos, golondrinas:},
	year = {ene./mar. 1991},
	address = {Pennsylvania},
	url = {http://revista-iberoamericana.pitt.edu/ojs/index.php/Iberoamericana/article/download/4858/5018}
}