programming for microcontroller using c - ebook??

i am working on a line follower robot..i need guidance for programming the microcontroller using c language...can u please suggest an ebook..i have tried searching on the net but couldnt find any book..plz help...

Which microcontroller?

Mike has found a new C tutorial for 16F series.

http://www.fored.co.uk/html/learn_c_with_fed.htm

And for 18F look 3V0s ones.

http://www.rocklore.com/3v0/