Help with site links www and non www

Hi there I have been building links to my site for non www i.e http://domain.com/page1.html
http://domain.com/page2.html

However when I check the serps the serps always show the www version of the site with very few links

When I type in www.domain.com into the browser it always redirects to the non www version.

With this in mind do I still need to do a 301 redirect from non www to www or is this already being done.

My site is on wordpress.

this is called chronically redirect and it is internally in website you dun need to do any thing just do link building.. if you have any doubts in your mind then please change it with the help of web designer/developer.. i had gone through this problem..