@book{47898,
	author = {Vliegenthart, W.E.},
	title = {Algemene orthopedagogiek :},
	publisher = {Wolters-Noordhoff,},
	year = {1973.},
	series = {Orthopedagogische geschriften ;},
	address = {Groningen :},
	edition = {3de uitgawe.}
}