Cita APA (7th ed.)
Morrison, D. Exploring Planetary Worlds. Scientific American.
Cita Chicago (17th ed.)
Morrison, David. Exploring Planetary Worlds. Nueva York, EUA: Scientific American.
Cita MLA (9th ed.)
Morrison, David. Exploring Planetary Worlds. Scientific American.
Atenció: Aquestes cites poden no estar 100% correctes.