@book{63855,
	author = {Büttner, August},
	title = {Zweierlei Denken: Ein Beitrag zur Physiologie des Denkens},
	publisher = {Project Gutenberg,},
	year = {2007},
	address = {Salt Lake City, UT :},
	note = {Release date is 2007-09-23},
	url = {https://www.gutenberg.org/ebooks/22738}
}