ACM - affordances
Ronald Baecker
ACM SIGGRAPH Computer Graphics
Human factors in computer and information systems (Winthrop computer systems series), Winthrop Publishers, 1980
On conversational interaction with computers
The Art of Natural Graphic Man-Machine Communication
The keystroke-level model for user performance time with interactive systems
Studies in Interactive Computer Graphics, Proceedings of the IFIP Conference, 1977, pp
Making nested rotations convenient for the user