@book{297806,
	author = {Crosby, Alfred. and McNeill, Professor J. R.},
	title = {The Columbian Exchange :},
	publisher = {Praeger,},
	year = {2003.},
	address = {Westport, Conn. : },
	edition = {30th ed.},
	url = {https://login.ezproxy.pucpr.edu/login?url=https://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=1093811}
}