Dyfyniad APA

(1971). The economics of technological change: Selected readings. Harmondsworth: Penguin.

Dyfyniad Arddull Chicago

The Economics of Technological Change: Selected Readings. Harmondsworth: Penguin, 1971.

Dyfyniad MLA

The Economics of Technological Change: Selected Readings. Harmondsworth: Penguin, 1971.

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