Buchkapitel
Stern, E. (1998). Early training: Who, what, when, why, and how? In
M. Beishuizen,
K. P. E. Gravemeijer, &
E. C. D. M. van Lieshout (Eds.),
The role of contexts and models in the development of mathematical strategies and procedures (pp. 239–253). C. D. B. Press.