@book{2684,
	author = {Singh , GPI},
	title = {Multiple Choice Questions in Preventive and Social Medicine},
	publisher = {Relx },
	year = {2008},
	address = {India },
	url = {http://paramountbooks.com.pk/loginindex.asp?title=Mcqs-In-Preventive-And-Social-Medicine-(pb)2008&ISBN=9788131212912&opt=3&SubCat=06}
}