@book{68607,
	author = {Roscher, Wilhelm, and Wolowski, L.},
	title = {Principles of Political Economy, Vol. 1},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Translation of System der volkswirthschaft.},
	url = {https://www.gutenberg.org/ebooks/27698}
}