Dyfyniad APA

UNESCO. (1999). Adult learning and the challenges of the 21st century. UNESCO.

Dyfyniad Arddull Chicago

UNESCO. Adult Learning and the Challenges of the 21st Century. Germany: UNESCO, 1999.

Dyfyniad MLA

UNESCO. Adult Learning and the Challenges of the 21st Century. UNESCO, 1999.

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