1. Census of India (2011) Primary census abstract, UA/Towns. Office of the Registrar General & Census Commissioner, India, New Delhi (compact disk form)
2. Census (2006) “Population projections for India and states 2001–2026.” Report of the technical group on population projections. Registrar General & Census Commissioner, India
3. http://www.oecd-ilibrary.org/docserver/download/0413091ec008.pdf
4. Boix R, Veneri P (2009) Metropolitan areas in Spain and Italy. IERMB Working Paper in Economics Nr. 09.01. Barcelona
5. Brezzi M, Piacentini M, Sanchez-Serra D (2012) Measuring metropolitan areas: a comparative approach in OECD countries. In: Fernández Vázquez E; Rubiera-Morollón F (eds) Defining the spatial scale in modern regional analysis. New challenges from data at local level. Advantages in spatial science—the regional science series, pp 71–89, Springer, Dordrecht