Ego and the Id (WW Norton & Co)

In 1923, in this volume, Freud worked out important implications of the structural theory of mind that he had first set forth three years earlier in "Beyond the Pleasure Principle. The Ego and the Id" ranks high among the works of Freud's later years. The heart of his concern is the ego, which he sees battling with three forces: the id, the super-ego, and the outside world.