The Artists' Bluebook is an international database of over 270,000 visual artists developed by AskART since 1999 (http://www.askart.com/AskART/help/AskART_about_us.aspx). Revised from its original 1993 print and CD format to digital online access, the Artists' Bluebook is considered a favorite resource for research into artists' lives, artworks and values, and where to buy or sell.
References
Artists' Bluebook Wikipedia(Text) CC BY-SA