1. Tree;McCauley,1984
2. Computer Science Logo Style, Vol 1: Intermediate Programming;Harvey,1985
3. Give'on Y.S., Teaching recursive program composition in procedural environments. Machine Mediated Learning3(2), (in press).
4. Thinking about [TLC] LOGO: a Graphic Look at Computing with Ideas;Allen,1984
5. Visual Modelling with LOGO;Clayson,1988