Ambika Roy Bardhan, Demographic and Socio-Economic Study of the Elderly Population in Kolkata, India. journal = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology. October 2019, vol. 155(11). 1419 - 1426 [viewed 28 February 2021]. Available from: https://publications.waset.org/pdf/10010872.