Multimodal User Interfaces: Designing media for the auditory and the haptic channel (Hempel, T.; Altinsoy, E.)
in Handbook of Human Factors in Web Design. Contributors: Robert W. Proctor - editor, Kim-Phuong L. Vu - editor. Publisher: Lawrence Erlbaum Associates. Place of Publication: Mahwah, NJ. Publication Year: 2005.