There's just really not much out there for autograph price guides. A few but all are outdated and no prices for newer celebs being the main problem. One is "The Official Autograph Collectors Price Guide" published 2001. And the "Standard and Advanced Guides to autograph collecting" by Baker published in 1999 and 2000. There are a few others I have found cheap on amazon also but like i said all are outdated but do have examples of signatures and price guides