@book{62128,
	author = {Davis, Calvin Olin,},
	title = {A Guide to Methods and Observation in History :},
	publisher = {Project Gutenberg,},
	year = {2007},
	address = {Salt Lake City, UT :},
	note = {Release date is 2007-03-24},
	url = {https://www.gutenberg.org/ebooks/20893}
}