1. Child-created mathematics;Cochran;The Arithmetic Teacher,1970
2. Teaching models for college mathematics;Copes,1974
3. Interacting reflections on a young pupil's work;Duffin;For the Learning of Mathematics,1991
4. Natural, conflicting and alien: A forum for discussion;Duffin;Proceedings of the 21st November, 1992 Day Conference of the BSRLM,1992
5. Three case studies: Analysis, links, speculations and questions;Duffin;Proceedings of the 22nd May, 1993 Day Conference of the BSRLM,1993