Dyfyniad APA

(1979). Facing the future: Mastering the probable and managing the unpredictable. Paris: Organisation for Economic Co-operation and Development.

Dyfyniad Arddull Chicago

Facing the Future: Mastering the Probable and Managing the Unpredictable. Paris: Organisation for Economic Co-operation and Development, 1979.

Dyfyniad MLA

Facing the Future: Mastering the Probable and Managing the Unpredictable. Paris: Organisation for Economic Co-operation and Development, 1979.

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