You can find a listing of collectible doll values in print resources such as Kovels.com's Antiques & Collectibles and Antique Trader Antiquities & Collectibles. Searching listings on eBay also provides information regarding value.
Both the Kovels.com and Antique Trader print pricing resources are available from the respective websites, as well as from larger bookstores, online book retailers and libraries. When reviewing current and recent eBay auctions, search for identifying characteristics of the doll first and then refine as needed to pinpoint the doll in question. As of 2015, antiques appraiser Dr. Lori charges $25 per object for an appraisal based on photographs of the item.