@book{142486,
	author = {Witker, Jorge. and Porras Olalla, Germán.},
	title = {Cómo elaborar una tesis en derecho },
	publisher = {Civitas, },
	year = {1986.},
	series = {Formularios y manuales prácticos},
	address = {Madrid : },
	edition = {1ª ed.}
}