Dyfyniad APA

Alcohol Health & Research World. National Institute on Alcohol Abuse & Alcoholism.

Dyfyniad Arddull Chicago

Alcohol Health & Research World. National Institute on Alcohol Abuse & Alcoholism.

Dyfyniad MLA

Alcohol Health & Research World. National Institute on Alcohol Abuse & Alcoholism.

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