Schwab, K. (2017). The fourth industrial revolution. Portfolio Penguin.
Cita Chicago (17th ed.)Schwab, Klaus. The Fourth Industrial Revolution. Great Britain: Portfolio Penguin, 2017.
Cita MLA (9th ed.)Schwab, Klaus. The Fourth Industrial Revolution. Portfolio Penguin, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.