Jim Murray's Whiskey Bible 2005 : Over 2500 Whiskeys Tasted, Evaluated and Rated by Jim Murray
Classic Blended Scotch by Jim Murray
Mitchell Beazley Pocket Guides: Scotch Whisky by Charles MacLean
MacLean's Miscellany of Whisky by Charles MacLean
Complete Guide to Single Malt Scotch by Michael Jackson.
Malt Whisky by Charles MacLean
Handbook of Whisky: A Complete Guide to the World's Best Malts, Blends and Brands by Dave Broom
A Double Scotch: How Chivas Regal and The Glenlivet Became Global Icons by F. Paul Pacult
These books can be hard to find, check abebooks.com or alibris.com
Appreciating Whisky or
Appreciating Whisky by Pip Hills
The Whisky Distilleries of the United Kingdom by Alfred Barnard. If you can find a copy of this, you should get it.
