Dyfyniad APA

National Geographic Society (Washington, D.C.), WQED (Television station : Pittsburg, Pa.), Cobbler, J., Joubert, B., & Joubert, D. (1990). Journey to the forgotten river [videorecording]. The Society.

Dyfyniad Arddull Chicago

National Geographic Society (Washington, D.C.), Pa.) WQED (Television station : Pittsburg, Jonathan Cobbler, Beverly Joubert, and Dereck Joubert. Journey to the Forgotten River [videorecording]. Washington, D.C: The Society, 1990.

Dyfyniad MLA

National Geographic Society (Washington, D.C.), et al. Journey to the Forgotten River [videorecording]. The Society, 1990.

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