Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/question-raised-lok-sabha-bharat-stage-vi-fuel-25112019
[2] http://www.indiaenvironmentportal.org.in/files/file/Bharat Stage VI Fuel.pdf
[3] http://admin.indiaenvironmentportal.org.in/category/publisher/lok-sabha
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-vi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/parliament