@book{90841,
	author = {Bölsche, Wilhelm,},
	title = {Schutz- und Trutzbündnisse in der Natur},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-09-18},
	url = {https://www.gutenberg.org/ebooks/50003}
}