Definitely Brewing Classic Styles. Stay away from the Szamatulski books and the Papazian recipes from the 1970s (the first because they are kind of questionable, the second because they are so vague and non-specific). There are also very good recipes in the Belgian beer series (Farmhouse Ales, Brew Like a Monk, Wild Brews), Gordon Strong's Brewing Better Beer, and Stan Hieronymus's Brewing with Wheat.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Primary: Saison, Berliner Weisse, sLambic I, sLambic II, IPA, 70/-
Secondary: Orange Blossom Mead, Flanders Red I
Kegged: Fat Man Porter w/ 1469, Fat Man Porter w/ 005, Centennial Falcon w/ Conan, Centennial Falcon w/ Denny's, Barrel-aged Fat Man Porter, Belgian Dark Strong, Dark Mild