@book{68688,
	author = {Geiger, Lazarus.},
	title = {Ursprung und Entwickelung der menschlichen Sprache und Vernunft /},
	publisher = {J.G. Cotta'schen Buchhandlung, },
	year = {1868-1872.},
	address = {Stuttgart : },
	url = {http://archive.org/details/ursprungundentw01geiggoog }
}