cite some content of these article into the research paper, and change the data for each part. I extent the years from 2006-2015 to 2002-2015.

writing these articles into the reference.

http://www.cluteinstitute.com/ojs/index.php/JABR/article/viewFile/8946/8868

http://www.nber.org/papers/w12373.pdf

http://www.nber.org/papers/w13771.pdf

http://www.gilcommunity.com/files/1613/6303/3035/41012909.pdf

ftp://ftp.fao.org/docrep/fao/meeting/013/k2051E.pdf

http://www.sc.ehu.es/oewhesai/iso%209000%20and%20profitability.pdf

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