1) B. Schneiderman: Designing the User Interface: Strategies for Effective Human-Computer Interaction, Addison-Wesley Publishing Company, 237-249, 1987.
2) H. J. Bullinger and R. Gunzenhauser: Software Ergonomics, Ellis Horwood Limited, 102-120, 1988.
3) B. A. Mayers: Coordinating User Interfaces by Demonstration, Academic Press, 141-173, 1988.
4) A. Monk: Fundamentals of Human-Computer Interaction, Academic Press, 108-110, 1989.
5) J. Nielsen: Coordinating User Interfaces for Consistency, Academic Press, 23-25, 1989.