i need to know the reference URL

Web analytics software will not only help you to track the number of visitors coming to your website, but would tell you where they came from, the amount of time they spent on your website, pages they visited, and a whole lot of other data pertaining to your website.

It is very easy...

you will need to add same kind a java script on you page just before body close tag (do it on master page)

here is my example

you can get analytics for your site here.......

http://www.google.com/analytics/

you will need to login to google in order to get a key for your site.