@book {9783818608811, 
	title = "Die Wildbienen Deutschlands",
	author = "Westrich, Paul",
	isbn = "9783818608811",
	edition = "2",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783818608811",
	url = "https://content-select.com/de/portal/media/view/5c7e5031-4a0c-45e6-9079-20a4b0dd2d03",
	publisher = "Verlag Eugen Ulmer",
	language = "ger",
}