@book{1915,
	author = {Levin, Donald A.},
	title = {The origin, expansion, and demise of plant species /},
	publisher = {Oxford University Press,},
	year = {2000.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0602/99034861-d.html}
}