@book{96958,
	author = {Normann, F. G.,},
	title = {Die Thurmuhr: eine Rechen-Fibel für kleine Kinder},
	publisher = {Project Gutenberg,},
	year = {2017},
	address = {Salt Lake City, UT :},
	note = {Illustrated by the author.},
	url = {https://www.gutenberg.org/ebooks/56127}
}