Cita APA (7th ed.)
Zander, R. S., & Zander, B. The Art of Possibility. Penguin.
Cita Chicago (17th ed.)
Zander, Rosamund Stone, i Benjamin Zander. The Art of Possibility. Nueva York, EUA: Penguin.
Cita MLA (9th ed.)
Zander, Rosamund Stone, i Benjamin Zander. The Art of Possibility. Penguin.
Atenció: Aquestes cites poden no estar 100% correctes.