@book{5277,
	author = {Heikkila, Timo A.},
	title = {Manual del carro de arrastre de trozas Sulky},
	publisher = {Finnida,},
	year = {1988},
	series = {FTP Publicaciones: extracción forestal},
	address = {Helsinki, Finland :},
	note = {56-233}
}