Dyfyniad APA

Harari, Y. N. (2018). 21 lessons for the 21st century (First edition.). Spiegel & Grau.

Dyfyniad Arddull Chicago

Harari, Yuval N. 21 Lessons for the 21st Century. First edition. New York: Spiegel & Grau, 2018.

Dyfyniad MLA

Harari, Yuval N. 21 Lessons for the 21st Century. First edition. Spiegel & Grau, 2018.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.