Witt, S. (1983). How to be twice as smart: Boosting your brain power and unleashing the miracles of your mind. Rewards Books.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (8ú heag.)Witt, Scott. How to Be Twice as Smart: Boosting Your Brain Power and Unleashing the Miracles of Your Mind. Rewards Books, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.