Dyfyniad APA

Barker, J. A. (1992). Future edge. New York: William Morrow and Company.

Dyfyniad Arddull Chicago

Barker, Joel Arthur. Future Edge. New York: William Morrow and Company, 1992.

Dyfyniad MLA

Barker, Joel Arthur. Future Edge. New York: William Morrow and Company, 1992.

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