Jean Berko 193
Susan Birch 191
Zhe Chen and Robert Siegler 190
Friedrich Frobel 194
Rochel Gelman 186
Geoffrey Hall and Susan Graham 193
Gisèle Héroux 186
Barbel Inhelder 185
Maria Montessori 194
John H. Mueller 181
Linda Pagani 196
Carole Peterson 186
Jean Piaget 184
Diane Poulin-Dubois 186
Lev Vygotsky 187
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