Here is one of the foundational works for psychoanalytic theory by Sigmund Freud, a book that influenced the further development of psychology and psychoanalytic theory. In “Totem and Taboo,” Freud looks at the origins of the emergence of culture and religion and compares the beliefs of primitive people with the fantasies of people with mental illnesses. This book will help you understand the complex workings of the human psyche, the formation of the most important mental processes, and the emergence of deviations.