APA (7th ed.) Citation

Hopgood, F. R. A. (1983). Introduction to the Graphical Kernel System (GKS). Academic Press.

Chicago Style (17th ed.) Citation

Hopgood, F. R. A. Introduction to the Graphical Kernel System (GKS). London : New York: Academic Press, 1983.

MLA (8th ed.) Citation

Hopgood, F. R. A. Introduction to the Graphical Kernel System (GKS). Academic Press, 1983.

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