identifying or how to figuring out referal site

Hello memebers,

I am new to this awesome reporting tool, however i am sort of lost because i am finding that we get this huge # hits from Keyword not defined refereal sites and this other site called api.gawker.com

Do you guys know how to determine why and how the hits are coming from the those two sites and how to define them?

Thanks!

I am trying to figure out the stats for marketing campaign.:S