Source
Global News
http://www.globalne.ws/Latest/D/4028810e4113bd1f01411b93fe5d7775/About-75--funding-of-six-major-political-parties-is-from-unknown-sources-#.UjaL-cZQE0N
Date
City
New Delhi
An analysis by Association of Democratic Reforms -ADR of Income Tax returns and statements filed by Congress, BJP, CPI-M, CPI, NCP and BSP with the Election Commission shows that between 2004 to 12, these political parties received funding worth Rs3,675 crore through unknown sources