Singh, Supriya (13 April 2006). "Domestic money becomes virtual". User Centred Design of Financial Services Project News. 4 (2). Archived from the original on 17 February 2011. Retrieved 28 July 2010.
Singh, Supriya (13 April 2006). "Domestic money becomes virtual". User Centred Design of Financial Services Project News. 4 (2). Archived from the original on 17 February 2011. Retrieved 28 July 2010.