After having built-in bookcases previously where books were ruined by sticking to the paint, we got a special kind at SW formulated so things won't stick. I can't remember the name of the formulation, and we don't have the can any more, but my advice is to keep asking at SW until you find someone who actually knows what you're talking about when you say you want paint for a bookcase. (The first person may know, but not always.) Ours are done in white.Good luck!

I'm sure someone at SW can help you. You probably want semi-gloss though. After our built-in's were painted, we were instructed by the painter not to use them for over a week so they could cure. He used SW paint.

But the wrong type of paint will still stick. We waited even longer than a week to put anything on our bookcases. Just so you know.

Minwax Polycrylic on top of the paint will keep books from sticking. Worked really well on my cookbook shelves. It's like polyurethane but without the yellowing problems.
If you use the satin finish it's pretty much invisible. All you see is the paint.