> CBT has been shown to be effective for the treatment of BPD?
>
> Reference please...
>
> I know about schema therapy (cognitive therapy)
> I know about DBT (dialectical behaviour therapy)
>
> Are you using CBT to refer to the above two or is there something I'm missing?

Cognitive-behavioral therapy is a broad category that includes many related therapeutic approaches. Certainly DBT is a cognitive-behavioral therapy and Schema Therapy is generally seen as cognitive-behavioral (I'm not sure how Jeff Young sees it currently, I haven't talked with him in a while). Other CBT approaches that have at least some empirical support with BPD include Beck's Cognitive Therapy, Arntz's hybrid of Cognitive Therapy and Schema Therapy, and Davison's approach used in the BOSCOT study.

I don't have a full set of references handy but the references given in the first two posts in this thread are a good starting place.