I well I'm a CS student, so I saved some of my money in order to buy some programming books, as I haven't much money to spare then I would like to use it the best way. My University Library already has the following famous books (so I wont buy them):

C How to Program by Deitel and Deitel
The C Programming Language by Schildt
The ANSI C Programming Language by Kernighan and Richie
Programming in C/C++ The Bible by Kris Jamsa and Lars klander

I was looking for something good for Linux programming, and also some strong reference for deeper topics, so what would you suggest me to buy?
Thx a lot by the patience.