The classic of classics on symbols. Nothing lacks. Everything is clearly explained and you will find that you are much more were picked. This dictionary is in the bibliography of all authors who publish books on mythology, religions, arts of divination, the symbolism found in painting, literature, storytelling. Check, it's fun! Reference book if any, it may be a little competition from the encyclopedia of symbols Michel Cazenave. The latter has its novelty but Gheerbrand Knight and reputation. Personally, I consult both books, they are complementary and their differences are interesting. No, I will not tell you which one I prefer, they are both excellent.