@book{20709,
	author = {Petersen, James F. and Sack, Dorothy Irene,},
	title = {Fundamentals of physical geography /},
	publisher = {Brooks/Cole,},
	year = {2011.},
	address = {Belmont, CA :},
	edition = {1st ed.},
	note = {Includes index.},
	url = {https://www.loc.gov/catdir/enhancements/fy1612/2009936341-b.html}
}