Dyfyniad APA

(1980). Energy to the 21st century [proceedings]. American Institute of Aeronautics and Astronautics.

Dyfyniad Arddull Chicago

Energy to the 21st Century [proceedings]. New York: American Institute of Aeronautics and Astronautics, 1980.

Dyfyniad MLA

Energy to the 21st Century [proceedings]. American Institute of Aeronautics and Astronautics, 1980.

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