Difford's Guide to Cocktails #12 includes 3,000 new and 1,200 updated recipes. It is the most complete and authoritative cocktail guide available and boasts the world's largest single photographic collection of cocktails. Designed for professional bartenders and home enthusiasts alike this heavyweight book is an indispensable guide to mixed drinks.
This is a great reference book for bartenders who want a brief note on the drink as well as clear instructions on making and serving it. It comes in handy if you don't know what you want to make but don't feel like browsing the website for recipes. I'm an old geezer so I'd much rather browse a book than use a search menu.
If you're looking for an exhaustive book of cocktail recipes, this is it. Pictures of every cocktail (how many books leave you hanging after they tell you what's in the drink?), a rating, and directions. LOTS of cocktails.