I'm not joking when I say there's a body of research. You can find a lot of it in journals that deal with organizational behavior, strategic management, and strategic HR.

I mentioned specifically the oft-used unstructured interview. Here are some links for that point:

>Meta-analysis: " structured interviews produced mean validity coefficients twice as high as unstructured interviews" http://onlinelibrary.wiley.com/doi/10.1111/j.2044-8325.1988....

>Meta-analysis: All interview validity estimated at .19, but structured interviews estimated at .39: http://onlinelibrary.wiley.com/doi/10.1111/j.2044-8325.1989....

Outside of boring journals and texts that you might not have access to, we can always just Google Scholar for things like "employment selection instrument": http://scholar.google.com/scholar?q=employment+selection+ins...