Dyfyniad APA

(1989). Research in engineering design [electronic resource].

Dyfyniad Arddull Chicago

Research in Engineering Design [electronic Resource]. 1989.

Dyfyniad MLA

Research in Engineering Design [electronic Resource]. 1989.

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