What is the name of the book by Sigmund Freud about Metaphysics?

Question: What is the name of the book by Sigmund Freud about Metaphysics!?
Best Answer - Chosen by Asker:

"The Future of an Illusion" (i think)

here's a list of all his books
http://www!.biblio!.com/author_biographies!.!.!.Www@QuestionHome@Com

The Interpretation of Dreams

OR

Totem and Taboo: Resemblances Between the Psychic Lives of Savages and Neurotics

Both are by Sigmund Freud!.Www@QuestionHome@Com