@book {9783800191833, 
	title = "Alles über Naturstein",
	author = "Friedrich, Volker",
	isbn = "9783800191833",
	edition = "2",
	keywords = "Garten, Amateur",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783800191833",
	url = "https://content-select.com/de/portal/media/view/519cc6ab-7880-46eb-a45c-29105dbbeaba",
	publisher = "Verlag Eugen Ulmer",
	language = "ger",
}