Hey guys, I have been looking around at some books lately and came across some old books like the Sanders Guide, etc.  What is a good book guide that will tell you the market value for sports autographs?  What about a book with examples of authentic sigs and their fakes?

I know the market changes daily so would a website be a better source?  If so which ones (other than this one) would give good up to date values and some examples of sigs. I dont want to be a paid member so please list some that are free.

Thanks