@book{24748,
	author = {Morrill, Richard L. and Gaile, Gary L.},
	title = {Spatial diffusion /},
	publisher = {Sage Publications,},
	year = {c1988.},
	address = {Newbury Park :},
	url = {http://www.loc.gov/catdir/enhancements/fy0654/87062683-d.html}
}