Cita APA (7th ed.)
Lidwell, W., & Holden, K. (2003). Universal principles and design. Rockport Publishers.
Cita Chicago (17th ed.)
Lidwell, Wiliiam, i Kritina Holden. Universal Principles and Design. Beverly, Massachusetts: Rockport Publishers, 2003.
Cita MLA (9th ed.)
Lidwell, Wiliiam, i Kritina Holden. Universal Principles and Design. Rockport Publishers, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.