Dyfyniad APA

Norman, D. A. (1988). The design of everyday things. New York: Doubleday.

Dyfyniad Arddull Chicago

Norman, Donald A. The Design of Everyday Things. New York: Doubleday, 1988.

Dyfyniad MLA

Norman, Donald A. The Design of Everyday Things. New York: Doubleday, 1988.

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