@book{71381,
	author = {Palacio Valdés, Armando,},
	title = {El origen del pensamiento},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-11-23},
	url = {https://www.gutenberg.org/ebooks/30535}
}