@book{1054,
	author = {Park, k},
	title = {Park's Textbook of Preventive and Social medicine/},
	publisher = {Banarsidas Bhanot,},
	year = {2002.},
	address = {India},
	edition = {21st ed.},
	url = {https://www.worldcat.org/title/parks-textbook-of-preventive-and-social-medicine/oclc/45359145}
}