Cita APA (7th ed.)
Norton, A. H. Futures Unlimited. Pyramid Books.
Cita Chicago (17th ed.)
Norton, Alden H. Futures Unlimited. Nueva York, EUA: Pyramid Books.
Cita MLA (9th ed.)
Norton, Alden H. Futures Unlimited. Pyramid Books.
Atenció: Aquestes cites poden no estar 100% correctes.