Links:
[1] http://www.wiego.org/informal-economy/statistical-picture
[2] http://www.wiego.org/wiego/wiego-briefs
[3] http://www.wiego.org/informal-economy/development-statistics-informal-economy
[4] http://www.wiego.org/informal-economy/concepts-definitions-methods
[5] http://www.wiego.org/sites/wiego.org/files/publications/files/improving_statistics.pdf
[6] http://www.wiego.org/informal-economy/challenges-gathering-statistics-street-vendors
[7] http://www.wiego.org/informal-economy/economic-contribution-informal-economy
[8] http://www.wiego.org/wiego/events-help-sewa-celebrate-40-years
[9] http://www.wiego.org/informal-economy/wiego-and-wiego-related-publications-statistics
[10] http://www.wiego.org/informal-economy/gender-differences-structure-employment
[11] http://www.wiego.org/wiego/statistics-meetings-informal-economy
[12] http://unstats.un.org/unsd/methods/citygroup/delhi.htm
[13] http://mospi.nic.in/Mospi_New/site/DelhiGroup.aspx
[14] http://www.wiego.org/related/pages/43/1156/16%2B15?page=1
[15] http://www.wiego.org/related/pages/43/1156/16%2B15