Enderle, G., Pfaff, G., & Kansy, K. (1984). Computer graphics programming: GKS, the graphics standard. Springer-Verlag.

Enderle, G., G. Pfaff, and K. Kansy. Computer Graphics Programming: GKS, the Graphics Standard. Berlin ; New York: Springer-Verlag, 1984.

Enderle, G., et al. Computer Graphics Programming: GKS, the Graphics Standard. Springer-Verlag, 1984.