Dyfyniad APA

National Geographic Book Service & National Geographic Society (U.S.). (1990). The Soviet Union today. National Geographic Society.

Dyfyniad Arddull Chicago

National Geographic Book Service and National Geographic Society (U.S.). The Soviet Union Today. Washington, D.C.: National Geographic Society, 1990.

Dyfyniad MLA

National Geographic Book Service and National Geographic Society (U.S.). The Soviet Union Today. National Geographic Society, 1990.

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