@book{144007,
	author = {Shippen, J. M. and Turner, J. C.},
	title = {Maquinaria agrícola básica / },
	publisher = {Acribia, },
	year = {1968-1969.},
	series = {Manuales de Técnica Agropecuaria},
	address = {Zaragoza : },
	note = {Son los tomos 1º y 2º.}
}