Dyfyniad APA
Norman, D. A. (2007). The design of future things. Basic Books.
Dyfyniad Arddull Chicago
Norman, Donald A. The Design of Future Things. New York: Basic Books, 2007.
Dyfyniad MLA
Norman, Donald A. The Design of Future Things. Basic Books, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.