Survey of Computer Graphics
The download page offers various versions of the POVray 3.6 for download (Windows 32bit, 64bit, and Linux), don't worry about the 3.7beta version of the program. There is an HTML documentation, but you can also download it in pdf and postscript (as zipped archives).
Computer Graphics, Principles and Practice,
Second Edition, Foley, van Dam, Feiner, Hughes (Addison- Wesley, 1995).
Classic and comprehensive text on the subject. Detailed coverage of mathematical underpinnings.