Geometric Algebra for Computer Graphics, John Vince, Springer, 2008
ISBN: 978-1-84628-996-5
This book is one of a series on mathematics for computer graphics by John Vince. See http://johnvince.co.uk/.
This is a very clear text setting out the basics of CliffordAlgebra for those who have not studied it before. -- JohnFletcher
See also CliffordAlgebraResources.