Dyfyniad APA

(1988). Inventors and discoverers: Changing our world. Washington, D.C: National Geographic Society.

Dyfyniad Arddull Chicago

Inventors and Discoverers: Changing Our World. Washington, D.C: National Geographic Society, 1988.

Dyfyniad MLA

Inventors and Discoverers: Changing Our World. Washington, D.C: National Geographic Society, 1988.

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