Dyfyniad APA

Memory (Medletter). UC Berkeley School of Public Health.

Dyfyniad Arddull Chicago

Memory (Medletter). UC Berkeley School of Public Health.

Dyfyniad MLA

Memory (Medletter). UC Berkeley School of Public Health.

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