Grand Livre De Cuisine
Alain Ducasse
Ducasse Books
This is a brilliant reference for Professional Chefs, I say Professional chefs because of the basis knowledge one would need to really appreciate the valve of this superbly constructed piece of work. 

This book is more than a book it is an investment for Chefs, especially for the next generation of young chefs. For the amount of information one can extract and the quality of photos and recipes the price is not to heavy.