@book{72127,
	author = {Frick, Joseph},
	title = {500 Rätsel und Rätselscherze für jung und alt :},
	publisher = {Project Gutenberg,},
	year = {2010},
	address = {Salt Lake City, UT :},
	note = {Release date is 2010-02-15},
	url = {https://www.gutenberg.org/ebooks/31281}
}