The Standard C Programming Language: Kernighan, Ritchie
Posted by Mark on December 14th, 2005
This is IT. This is THE C book. The only one you really need 
Few books travel with me wherever I go for as long as this one did. I carried this everywhere for about 4 years, and I STILL keep it close by if I need it for any reference. Aside from the being the definitive source of C information, it also has some quick explanations and syntax guides to most of the standard library in the back.