APA Citation

Oulasvirta, A., & Abowd, G. D. User interface design in the 21st Century.

Chicago Style Citation

Oulasvirta, Antti,, and Gregory D. Abowd. User Interface Design in the 21st Century.

MLA Citation

Oulasvirta, Antti,, and Gregory D. Abowd. User Interface Design in the 21st Century.

Warning: These citations may not always be 100% accurate.