Lua APA (7ú heag.)

Harari, Y. N. (2019). 21 lessons for the 21st century. Vintage.

Lua i Stíl Chicago (17ú heag.)

Harari, Yuval N. 21 Lessons for the 21st Century. London: Vintage, 2019.

Lua MLA (9ú heag.)

Harari, Yuval N. 21 Lessons for the 21st Century. Vintage, 2019.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.