NAVratna companeezz..
http://en.wikipedia.org/wiki/Navratna
http://www.businessnewsthisweek.com/2010/05/navratna-companies-most-successful.html
http://www.currentaffairsindia.info/2012/08/navratna-companies-of-india.html
http://www.pbr.co.in/
www.pbr.co.in/vol3iss4/chapter%208.pdf
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