@book{15554,
	author = {Taylor, F. M.},
	title = {Key to problems in Principles of economics.},
	publisher = {Ronald Press Company,},
	year = {1921.},
	address = {New York,},
	edition = {(8th ed.)},
	url = {http://hdl.loc.gov/loc.gdc/scd0001.00137210307}
}