@book{6696,
	author = {Pollard, J. H.},
	title = {Mathematical models for the growth of human populations /},
	publisher = {University Press ,},
	year = {c1973 [ Reprinted 1980].},
	address = {Cambridge [Eng.] :},
	url = {http://www.loc.gov/catdir/enhancements/fy1302/72091957-d.html}
}