Bailey, M. J. and Anderson, D. C. "Minicomputer speakeasy in a dynamic graphics environment" pp428-433

[ACM] Proceedings of the 1977 ACM Annual Conferenc (1977) [ACM] Proceedings of the 1977 ACM Annual Conference, Seattle, Washington, Oct. 16-19, 1977  

Languages mentioned GRAFIC {1976} SKETCH {1977} SPEAKEC {1977}