Barbel Finkenstadt

Edited By Barbel Finkenstadt, Holger Rootzen

Edited By Barbel Finkenstadt, Leonhard Held, Valerie Isham

Edited By Bärbel Kühn, María Luisa Pérez Cavana

By Kathy Barbell, Lois Wright

Edited By Norbert Schwarz, Denise Park, Barbel Knauper, Seymour Sudman

Edited By Barbel Inhelder, J. M. Tanner

By Barbel Inhelder, Hermine Sinclair, Magali Bovet

Edited By Arnold J. Pomerans, Jean Piaget, Bärbel Inhelder

By Piaget, Jean & Inhelder, Barbel & Szeminska, Alina

Edited By Barbel Inhelder, J. M. Tanner

Edited By Barbel Inhelder, Denys de Caprona, Angela Cornu-Wells

Edited By Barbel Inhelder, J. M. Tanner