What are the Reference books or websites for line following robot?

· "Robot Building for Beginners"by David Cook

· "Build Your Own All-Terrain Robot" by Brad Graham and Cathy McGowan

· Designing Embedded Systems with PIC Microcontrollers, Second Edition: Principles and Applicationsby Tim Wilmshurst (December 17, 2009)

· Programming 16-bit Microcontrollers in C: Exploring the PIC32 (Embedded Technology) byLucio Di Jasio (December 28, 2008)