Hélder Rodrigues

Edited By Aurelio Araujo, Hélder Rodrigues, José Herskovits, Christóvão Mota Soares, José Miranda Guedes, João Folgado, Filipa Moleiro, José Aguilar Madeira

Edited By Gretchen Miller Wrobel, Emily Helder, Elisha Marr

By Pierre Oléron, Jean Piaget, Bärbel Inhelder, Pierre Gréco

By Jean Piaget, Bärbel Inhelder

By John D. Leshy, Barbel Inhelder

Edited By Helder De Schutter, David Robichaud

Edited By Ana Cristina Broega, Joana Cunha, Helder Carvalho, Manuel Blanco, Guillermo García-Badell, Diana Goméz-Chacón

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

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

By João Rodrigues, Michael Cooper

Edited By Barbel Inhelder, J. M. Tanner

By Barbel Inhelder, Hermine Sinclair, Magali Bovet