Collection Ingénium - L'Harmattan 2001 ISBN : 2-7475-1970-8 ? 304 pages
Published by the Elmwood Institute, Berbeley, CA 94705. Edited by "Systems Education Research", Olympia, Wa 98502, first édition, winter 1990 104 pages.
Presses de l'Ecole Nationale des Ponts etChaussées, 1994. 206 p.