How do I get audio books in wma format to play on my car's wma/mp3 cd player?

The Los Angeles Library uses http://www.overdrive.com/MediaConsole/ for digital rights management for their audio books. I follow all the instructions for burning a wma data CD but my car's wma cd player just says "Reading Disc..." and never plays it. The cd player is a wma/mp3 cd player not just a normal CD player.