ACM - affordances
Ronald Baecker
Proceedings of the 8th annual conference on Computer graphics and interactive techniques - SIGGRAPH ’81
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