@book{680,
	author = {Kopp, Gabriele Siegfried Büttner, Josef Alberti  and Büttner, Siegfried  and Alberti, Josef},
	title = {Planet A2 Arbeitsbuch },
	publisher = {Hueber Verlag },
	year = {2005},
	address = {Ismaning ; },
	edition = {1.Auflage}
}