Dyfyniad APA
Polak, P. (1976). A Background to engineering design. The Macmillan press Ltd.
Dyfyniad Arddull Chicago
Polak, Peter. A Background to Engineering Design. London: The Macmillan press Ltd, 1976.
Dyfyniad MLA
Polak, Peter. A Background to Engineering Design. The Macmillan press Ltd, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.