@misc{Office of the Registrar General and Census Commissionerno year,
author = {Office of the Registrar General and Census Commissioner},
title= {1971–2010 sample registration system},
year = {no year},
URL = {http://www.censusindia.gov.in/2011-Common/Sample_Registration_System.html},
publisher = {Office of the Registrar General and Census Commissioner},
address = {New Delhi},
}