@book{90313,
	author = {Greenhow, T. M.},
	title = {An Estimate of the True Value of Vaccination as a Security Against Small Pox},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-07-18},
	url = {https://www.gutenberg.org/ebooks/49475}
}