These early psychoanalysts are the neo-Freudians:
Carl Gustav Jung: Personal Unconscious and Collective Unconscious, archetypes
Alfred Adler: Seeking Superiority, Compensation, Birth Order
Karen Horney: Womb Envy, Basic Anxiety, Neurotic Personalities
Erik Erikson: Eight Psychosocial Stages
Below are suggested books from the library that focus on Neo-Freudian theory that may be useful for your research project.