Folk rock is a label used to describe music that is of personal subjects that has relatively simple instrumentation, but a thicker texture than "traditional" folk ballads and songs with choruses. Folk rockers are rockers without the sex and drugs. At least, without sex and rugs prominently displayed in the vast majority of their lyrics.

Am I being too cynical? ;-)

Folk rockers:
Indigo Girls (I am surprised no one mentioned them...)
Shawn Colvin
Suzanne Vega
Jewel
The Wallflowers...no despite being led by a Dylan, they're really rock. Well, maybe...


Truth be told, the lines between genres are hopelessly blurred at this point. I recently heard a "classic" style rock 'n' roll song on the country station. What used to be heavy metal in the 80's are now pathetic hair bands, and not considered heavy at all. (I take that back: they've always been hair bands.)
As listeners become more accustomed to certain textures, volumes and vocal styles, the genres become redefined.

Folk has always been honest. If a sense of being genuine doesn't come through in a performance by a "folk rocker" you can cross them off your list.

Good luck with your paper!