@book{183199,
	author = {Melendo, Tomás. and Fernández-Crehuet, Joaquín.},
	title = {Planificación familiar natural},
	publisher = {Ediciones Palabra},
	year = {1998.},
	series = {Hacer Familia},
	address = {Madrid},
	edition = {3ra ed.},
	note = {Bibliography : p. 269-271.}
}