@book {9783816982944, 
	title = "Einsatzhärten",
	isbn = "9783816982944",
	edition = "4",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783816982944",
	url = "https://content-select.com/de/portal/media/view/5b56fc24-616c-4a4d-9579-5d67b0dd2d03",
	publisher = "expert verlag",
}