1. Chandramouli C. Census of India 2011 - A story of Innovations. Press Information Bureau, Government of India. http://www.censusindia.gov.in . Accessed on 15 November 2012.
2. United Nations. World Urbanization Prospects: The 2011 Revision Highlights. United Nations, Department of Economic and Social Affairs/Population Division. United Nations, New York. http://esa.un.org/unup/pdf/WUP2011_Highlights.pdf . Accessed on 15 November 2012.
3. Government of India. Situation analysis of the elderly in India. Central Statistics Office, Ministry of Statistics & Programme Implementation, Government of India, June 2011.
4. Irudaya Rajan S. In: Dey AB, editor. Ageing in India, situational analysis and planning for the future. New Delhi: Rakmo Press; 2003.
5. United Nations. World population ageing: 1950–2050. New York: Department of Economic and Social Affairs, Population Division, United Nations; 2002.