http://www.amazon.com/Rendering-Beginners-Image-Synthesis-RenderMan/dp/0240519353
Homepage: http://www.smartcg.com/tech/cg/books/RfB
The book's cover is featured in this mathematical book covers page (click on 'Penrose Triangle').
And second (co-authored with my friend Rudy Cortes):
http://www.amazon.com/RenderMan-Shading-Language-Guide/dp/1598632868
Homepage: http://rslprogramming.com/
A review, in 'Animation Magazine' (click to enlarge):
