I'd go with http://www.amazon.com/Reference-Manual-Samuel-P-Harbison/dp/... (non-aff link) for reference and something like one of these (non-aff links) for learning:

http://www.amazon.com/C-Programming-Modern-Approach-2nd/dp/0...

http://www.amazon.com/Study-Guide-Programming-Modern-Approac...

http://www.amazon.com/Programming-3rd-Stephen-G-Kochan/dp/06... <=Dunno if it covers C99 either, but very basic