Dyfyniad APA

Ayres, R. U. (1969). Technological forecasting and long-range planning. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Ayres, Robert U. Technological Forecasting and Long-range Planning. New York: McGraw-Hill, 1969.

Dyfyniad MLA

Ayres, Robert U. Technological Forecasting and Long-range Planning. New York: McGraw-Hill, 1969.

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