Dyfyniad APA

Freeman, C. (1978). World futures: The great bebate. England: Martin Roberson.

Dyfyniad Arddull Chicago

Freeman, Chrisopher. World Futures: The Great Bebate. England: Martin Roberson, 1978.

Dyfyniad MLA

Freeman, Chrisopher. World Futures: The Great Bebate. England: Martin Roberson, 1978.

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