Dyfyniad APA

Plant, J. S. (1950). The envelope: A study of the impact of the world upon the child. Commonwealth Fund.

Dyfyniad Arddull Chicago

Plant, James Stuart. The Envelope: A Study of the Impact of the World upon the Child. New York: Commonwealth Fund, 1950.

Dyfyniad MLA

Plant, James Stuart. The Envelope: A Study of the Impact of the World upon the Child. Commonwealth Fund, 1950.

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