@book{46789,
	author = {Gordis, Leon},
	title = {Epidemiología},
	publisher = {Elsevier,},
	year = {2005},
	address = {España :},
	edition = {3},
	note = {Título en inglés, epidemiology},
	url = {http://biblioteca.unac.edu.co/portadas/51204.jpg}
}