Dyfyniad APA

Cancer Clusters (2018). National Cancer Institute Member Services.

Dyfyniad Arddull Chicago

Cancer Clusters (2018). National Cancer Institute Member Services.

Dyfyniad MLA

Cancer Clusters (2018). National Cancer Institute Member Services.

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