The Learnability of Object-Oriented Programming Systems - Panel. - Tim O'Shea; Jent Beck; Dan Halbert; Kurt J. Schmucker (OOPSLA, 1986)

Potentials and Limitations of Pen-Based Computers. - Takayuki Dan Kimura; Wayne Citrin; Dan Halbert; Carl Hewitt; Norman K. Meyrowitz; Ben Shneiderman (ACM Conference on Computer Science, 1993)