@book{89500,
	author = {Ruoff, Henry W.},
	title = {The Circle of Knowledge: A Classified, Simplified, Visualized Book of Answers},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-04-07},
	url = {https://www.gutenberg.org/ebooks/48661}
}