The WD Market Guides

The Writer's Digest "Market Guides" are those big heavy books that are lists of places that publish certain kinds of writers. Writer's Market Deluxe costs about $50.00, last I checked, and is a comprehensive collection of more than a thousand markets. There are other market guides, like Children's Writers and Illustrators' Markets that are about $25 and worth getting. If you have the spare change and are looking to really get serious about publication, I would aim for the WM Deluxe or see if your local library has a copy.