@book{71003,
	author = {Einstein, Albert, and Lawson, Robert W.},
	title = {Relativity: The Special and General Theory},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	edition = {Revised edition},
	note = {See also PG#5001},
	url = {https://www.gutenberg.org/ebooks/30155}
}