@book {9783865815835, 
	title = "Vielfältig nachhaltig für Berlin",
	editor = "Berlin 21 e.V., ",
	isbn = "9783865815835",
	year = "2013",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783865815835",
	url = "https://content-select.com/de/portal/media/view/52e695fc-8714-4dcb-83e6-2f4f2efc1343",
	publisher = "oekom verlag",
}