@book{6980,
	author = {K. Park},
	title = {Parks Text Book Of Preventive & Social Medicine},
	publisher = {Banarsidas Bhanot,},
	year = {2019.},
	address = {Jabalpur,},
	edition = {25th ed.},
	url = {https://www.amazon.com/Parks-Text-Preventive-Social-Medicine/dp/9382219153}
}