I have found Art Becker's guides the best reference sources. I particularly like and use the CD version. No searching for the stupid lost book. A nice tip is to copy the entire CD to a folder on your hard disk and place a short cut on your desktop. It is readily available even while online and loads much faster. I have found no errors and the prices are realistic. You can find it at http://www.artbecker.com and also on ebay.

WDS