Harari, Y. N. (2018). 21 lessons for the 21st century. Spiegel and Grau.
Cita Chicago (17th ed.)Harari, Yuval Noah. 21 Lessons for the 21st Century. New York: Spiegel and Grau, 2018.
Cita MLA (9th ed.)Harari, Yuval Noah. 21 Lessons for the 21st Century. Spiegel and Grau, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.