APA (7th ed.) Citation

Fehrle, T., Thies, M. A., Thies, M. A., & Berger, F. (1992). Intelligent user support in graphical user interfaces.

Chicago Style (17th ed.) Citation

Fehrle, Thomas, Markus A. Thies, Markus A. Thies, and Frank Berger. Intelligent User Support in Graphical User Interfaces. Kaiserslautern, 1992.

MLA (9th ed.) Citation

Fehrle, Thomas, et al. Intelligent User Support in Graphical User Interfaces. 1992.