Freud believed that the mind was divided into three parts: The preconscious, conscious, and unconscious. He also believed that the personality was also divided into three parts: Id, ego, super ego.
Sigmund Freud Max Halberstadt
The ego, id, and superego Iowa State University Digital Press
Child Development Theories Dulcie McBride
Below are suggested books from the library that focus on Freudian theory that may be useful for your research project.