Dyfyniad APA

Lidwell, W., & Holden, K. (2003). Universal principles and design. Rockport Publishers.

Dyfyniad Arddull Chicago

Lidwell, Wiliiam, and Kritina Holden. Universal Principles and Design. Beverly, Massachusetts: Rockport Publishers, 2003.

Dyfyniad MLA

Lidwell, Wiliiam, and Kritina Holden. Universal Principles and Design. Rockport Publishers, 2003.

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