@book{81143,
	author = {Viertel, Berthold,},
	title = {Die Spur},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-07-23},
	url = {https://www.gutenberg.org/ebooks/40304}
}