Witt, S. (1983). How to be twice as smart: Boosting your brain power and unleashing the miracles of your mind. Rewards Books.
Chicago-referens (17:e uppl.)Witt, Scott. How to Be Twice as Smart: Boosting Your Brain Power and Unleashing the Miracles of Your Mind. West Nyack, N.Y: Rewards Books, 1983.
MLA-referens (8:e uppl.)Witt, Scott. How to Be Twice as Smart: Boosting Your Brain Power and Unleashing the Miracles of Your Mind. Rewards Books, 1983.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.