Dunod, 1995 (Bordas, 1976 pour la lère édition française)
Published by the Elmwood Institute, Berbeley, CA 94705. Edited by "Systems Education Research", Olympia, Wa 98502, first édition, winter 1990 104 pages.
Ed. InterEditions - Paris 1991.
éditions Charles Léopold MAYER, 2009, ISBN 978 2-84377 147 7, 272 pages