Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tata-motors-leyland-step-gas-auto-lng
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tata-motors
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/liquefied-natural-gas-lng
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gujarat
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ashok-leyland