Editeur : Rivages
Edition l'Harmattan, collection Ingénium, ISBN : 2-7475-9256-1 2005 ? 288 pages
Published by the Elmwood Institute, Berbeley, CA 94705. Edited by "Systems Education Research", Olympia, Wa 98502, first édition, winter 1990 104 pages.
Ed. Fondation Archives Jean Piaget (Cahier n° 12 ), Genève, 1992, 120 pages.