@book{1978,
	author = {Knight, Frank H.},
	title = {Risk, uncertainty and profit /},
	publisher = {Houghton Mifflin company,},
	year = {c1921 [Reprinted 1957]},
	address = {Boston :},
	url = {http://hdl.loc.gov/loc.gdc/scd0001.00019647742}
}