1. http://www.hindustanpencils.com
2. M. Porter and Van der Linfde, ‘Green and Competitive’, HBR, Sept-Oct 1995.
3. ’Company Fact Sheet’, Starbucks Coffee Company. Nov 2006. 5 Feb. 2007 http://www.star-bucks.com/aboutus/Company_Factsheet.pdf
4. U.S. Environmental Protection Agency.
3.15.220.201