@book{91362,
	author = {Pierre, de Maricourt, active 13th century and Arnold, Brother,},
	title = {The Letter of Petrus Peregrinus on the Magnet, A.D. 1269},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-11-21},
	url = {https://www.gutenberg.org/ebooks/50524}
}