@BOOK{Mühle2003,
	AUTHOR = {Mühle, Ralf U AND Kaden, Klaus AND Jeltsch, Florian},
	YEAR = {2003},
	TITLE = {Die ökologische Station Gülpe der Universität Potsdam - Forschungen an der Unteren Havel},
	EDITION = {1. Aufl.},
	ISBN = {978---3-9-35-02-4},
	PUBLISHER = {Univ.-Verlag Potsdam},
	ADDRESS = {Potsdam},
}

@online{OpenStreetMap,
	EDITOR = OpenStreetMap-Mitwirkende,
	TITLE = OpenStreetMap,
	DATE = 2016-08-20,
	URL = www.openstreetmap.org
}