It wasn't the source which was the issue, the guy who reverted wrote: 

"20:20, 15 February 2008 White Cat (Talk | contribs) (94,225 bytes) (The validity of the genetic study is disputed therefoee I do not believe it is OK to put that into the infobox. See Origins of the Kurds#Validity and reliability of such genetic studies) (undo)"

So it seems he questioned the validity of DNA studies in general, not this particular one. But I assume Wikipedia should be based on science, so I've put it in again.

Anyhow, here's a source. There are many different studies that confirm the same, it's just a matter of picking an choosing.