Dyfyniad APA

Harari, Y. N. (2018). Twentyone lessons for the twentyfirst century. Jonathan Cape.

Dyfyniad Arddull Chicago

Harari, Yuval N. Twentyone Lessons for the Twentyfirst Century. London: Jonathan Cape, 2018.

Dyfyniad MLA

Harari, Yuval N. Twentyone Lessons for the Twentyfirst Century. Jonathan Cape, 2018.

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