APA (7th ed.) Citation

Ziegler, J. E. (1990). Eurographics'90: : Direct Manipulation Techniques for the Human-Computer Interfaces. Eurographics.

Chicago Style (17th ed.) Citation

Ziegler, Jürgen E. Eurographics'90: : Direct Manipulation Techniques for the Human-Computer Interfaces. Hamburg: Eurographics, 1990.

MLA (9th ed.) Citation

Ziegler, Jürgen E. Eurographics'90: : Direct Manipulation Techniques for the Human-Computer Interfaces. Eurographics, 1990.

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