Dyfyniad APA

Understanding Sleep (Brain Basics). National Institute of Neurological Disorders & Stroke.

Dyfyniad Arddull Chicago

Understanding Sleep (Brain Basics). National Institute of Neurological Disorders & Stroke.

Dyfyniad MLA

Understanding Sleep (Brain Basics). National Institute of Neurological Disorders & Stroke.

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