[AFIPS] Proceedings of the 1971 Fall Joint Computer Conference FJCC 39

[AFIPS] [AFIPS] Proceedings of the Joint Computer Conferences  

Hansen, Wilfred J. (1971) Hansen, Wilfred J. "User engineering principles for interactive systems" pp523-532 Wegbreit, B. (1971) Wegbreit, B. "The ECL Programming System" pp253-261