@book{73074,
	author = {Dawan, Ashok},
	title = {A textbook of environmental studies /},
	publisher = {Saurabh Publishing house},
	year = {2012},
	address = {New Delhi},
	note = {  Includes bibliographical references and index},
	url = {http://www.loc.gov/catdir/toc/ecip0721/2007025342.html}
}