Author
- Piaget, Jean, 1896-1980
- Inhelder, Bärbel 4 results
- Fraisse, Paul 3 results
- Inhelder, Barbel 3 results
- Beth, Evert Willem, 1908-1964 1 results
- Coltman, Derek 1 results
- Elkind, David, 1931- 1 results
- Erikson Institute 1 results
- Flavell, John H. 1 results
- Gattegno, Caleb 1 results
- Hodgson, F. M. 1 results
- Hooper, Frank H. 1 results
- Inelder, Barbel 1 results
- Loyola University, Chicago. Dept. of Psychology 1 results
- Loyola University, Chicago. School of Education 1 results
- Piers, Maria W. 1 results
- Sigel, Irving E. 1 results
- Weaver, Helen 1 results