@book{41545,
	author = {Schäfer, Alfred,},
	title = {Leistung /},
	publisher = {Verlag Ferdinand Schöningh,},
	year = {2015.},
	series = {Pädagogik - Perspektiven},
	address = {Paderborn :},
	url = {http://dx.doi.org/10.30965/9783657775989}
}