@book{137986,
	author = {Malthus, Thomas Robert},
	title = {Primer ensayo sobre la población},
	publisher = {Ediciones Orbis},
	year = {1985.},
	series = {El libro de bolsillo. Sección : Clásicos},
	address = {Madrid},
	edition = {2. ed.},
	note = {Translation of : An Essay on the Principles of Population.}
}