Dyfyniad APA

Attenborough, D. (2010). Life: Challenges of life, reptiles and amphibians, mammals. (DVD). BBC Worldwide Ltd. Program.

Dyfyniad Arddull Chicago

Attenborough, David. Life: Challenges of Life, Reptiles and Amphibians, Mammals. (DVD). California: BBC Worldwide Ltd. Program, 2010.

Dyfyniad MLA

Attenborough, David. Life: Challenges of Life, Reptiles and Amphibians, Mammals. (DVD). BBC Worldwide Ltd. Program, 2010.

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