@book{71623,
	author = {George, Pierre. and Giralt Pont, A.},
	title = {El medio ambiente / },
	publisher = {Oikos-Tau, },
	year = {[1972]},
	series = {Colección ¿Que sé? ; },
	address = {Vilassar de Mar : },
	edition = {[1ª ed.].}
}