@book{98785,
	author = {Karlson, Paul},
	title = {Tú y el mundo físico},
	publisher = {Editorial Labor},
	year = {1961.},
	series = {Colección Libros de hoy},
	address = {Barcelona},
	edition = {5. ed., actualizada y ampliada.},
	note = {Translation of Du und die Natur.}
}