PIC in Practice: An Introduction to the PIC Microcontroller by David W. Smith
The book can be used at a variety of levels. While the carefully graded practicals make it ideal for colleges and schools, many university students and professionals are also newcomers to PIC, so this book will provide a painless introduction for more advanced readers. In addition, electronics hobbyists will find this book to be an exciting introduction to the world of microcontrollers.