Dyfyniad APA

Petzold, P. (1979). Light on people (2nd ed.). Focal Press.

Dyfyniad Arddull Chicago

Petzold, Paul. Light on People. 2nd ed. London: Focal Press, 1979.

Dyfyniad MLA

Petzold, Paul. Light on People. 2nd ed. Focal Press, 1979.

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