The book C: A software engineering approach, 3rd edition by P.A. Darnell and P.E. Margolis published by Springer in 1996 has been recommended to me (although I have not looked at it myself).
You might want to look at a web page listing a number of network resources on programming in C.
If you are already familiar with C you might find the comp.lang.c Frequently Asked Questions interesting.
Tonghua found the following site on Programming in C .