@book{50033,
	author = {Markandey, Dilip Kumar and Rajvaidh, Nilima},
	title = {प्रकृति पर्यावरण प्रदूषण एवं नियंत्रण },
	publisher = {A. P. H. Publishing Corporation, },
	year = {1999},
	address = {New Delhi: }
}