Harari, Y. N. (2018). 21 lessons for the 21st century (First edition.). Spiegel & Grau.
Lua i Stíl Chicago (17ú heag.)Harari, Yuval N. 21 Lessons for the 21st Century. First edition. New York: Spiegel & Grau, 2018.
Lua MLA (9ú heag.)Harari, Yuval N. 21 Lessons for the 21st Century. First edition. Spiegel & Grau, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.