@book{80916,
	author = {Fetter, Frank A.},
	title = {The Principles of Economics, with Applications to Practical Problems},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-06-24},
	url = {https://www.gutenberg.org/ebooks/40077}
}