id	domain	url
fueconorg-2851	doi.org	https://doi.org/10.22190/fueo1703189r
fueconorg-2851	www.econlib.org	http://www.econlib.org/library/enc/humancapital.html
fueconorg-2851	www.jstor.org	http://www.jstor.org/stable/2486175