Die Traumdeutung
Freud's process of psychoanalysis is often quite lengthy and complex, as was the case with many of the dreams in his 1899 book "The Interpretation of Dreams". An obstacle that faces the non-German-speaking reader is such that in original German, "The Interpretation of Dreams", Freud's emphasis on "slips of the tongue" leads to the inclusion of a great deal of colloquial and informal material that are extremely resistant to translations.