@book{199637,
	author = {Steinberg, Steven J. and Steinberg, Sheila L.},
	title = {GIS},
	publisher = {SAGE Publications},
	year = {c2006.},
	address = {Thousand Oaks, Calif.},
	url = {http://www.loc.gov/catdir/toc/ecip059/2005007114.html}
}