éditions Payot, Lausanne, 1998, ISBN 2-601-03227-8. 251 pages.
Published by the Elmwood Institute, Berbeley, CA 94705. Edited by "Systems Education Research", Olympia, Wa 98502, first édition, winter 1990 104 pages.
Kluwer Academic Pub. Dordrecht, 1992. 248 p.