@book{20230,
	author = {Strahler, Alan H. and Merali, Zeeya.},
	title = {Visualizing physical geography /},
	publisher = {John Wiley & Sons,},
	year = {2008.},
	address = {Hoboken, NJ :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0806/2007299431-d.html}
}