You wanna basic documents or high level ones?
do you wanna read a book?
go to Knovel.com and register for 1 day free download, after that, you may register again with different email add.
and if you wanna study in sensor fusion robotics, you may search for Johann Borenstein webpages, Hans P. Moravec, Sebastian Thrun, Marsland,... I think their sites can help for high level robots.
for basic level, you may come any search for linefollower robot, it's basic.
I don't write the address here, because as you are searching, you should find many useful documentations. I gave you the keywords. Good luck