Dyfyniad APA

(2005). National geographic: Stem cells how far will we go? Washington, DC: National Geographic Society.

Dyfyniad Arddull Chicago

National Geographic: Stem Cells How Far Will We Go? Washington, DC: National Geographic Society, 2005.

Dyfyniad MLA

National Geographic: Stem Cells How Far Will We Go? Washington, DC: National Geographic Society, 2005.

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