1. Fundamentals of Interactive Computer Graphics;Foley,1984
2. Computer Graphics Programming;Enderle,1987
3. PHI-GKS: Programmer's Hierarchical Interactive Graphical Kernel System;Burkert,1988
4. Information Processing Systems 3-Computer Graphics—Graphical Kernel System (GKS),1985
5. International Standard ISO/IS 95921/1–3,1989