Cita APA (7th ed.)
Wheeler, J. A. A Journey into Gravity and Spacetime. Scientific American.
Cita Chicago (17th ed.)
Wheeler, John Archibald. A Journey into Gravity and Spacetime. Nueva York, EUA: Scientific American.
Cita MLA (9th ed.)
Wheeler, John Archibald. A Journey into Gravity and Spacetime. Scientific American.
Atenció: Aquestes cites poden no estar 100% correctes.