Dyfyniad APA

(1992). Resources and industry. New York: Oxford University Press.

Dyfyniad Arddull Chicago

Resources and Industry. New York: Oxford University Press, 1992.

Dyfyniad MLA

Resources and Industry. New York: Oxford University Press, 1992.

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