1. RTI
2. http://www.thehindu.com/news/cities/Delhi/metro-officials-summoned-in-zamrudpur-pillar-collapse-case/article3615938.ece
3. http://timesofindia.indiatimes.com/city/delhi/11-DMRC-officials-chargesheeted-in-2009-metro-pillar-collapse/articleshow/14734459.cms
4. http://economictimes.indiatimes.com/industry/indl-goods/svs/construction/delhi-metro-debars-gammon-for-two-years-over-zamrudpur-mishap/articleshow/6915877.cms
5. http://www.hindustantimes.com/delhi/11-metro-officials-charged-in-zamrudpur-mishap/story-4DtyF3kN0qtn1ah7eMPDxI.html
6. http://www.deccanherald.com/content/16390/design-consultant-misled-us-contractor.html