Hi,
You can consult with the following useful books:
1.An Introduction to programming Pic in CCS C by Nigel Gardner.
2.Programming 8 bit pic Microcontroller in C with Interactive Hardware Simulation by Martin P. Bates
3.Advanced Pic Microcontroller Projects in C by Dogan Ibrahim.
If you require more name of book, I will try to provide you. Please try to collect the above mentioned books, which I think will be of useful to you. Thanks.