lntersystems Publications ( The systems inquiry series) Salinas, Cal. - USA, 1985, 116p.
The University of Chicago Press, Chicago (Supplement of october 1986 issue of "the Journal of Business"), 1985, 355 pages.
Ed. ESF (Collection Communication et Complexité) Paris, 1989 199 p.
PUF. "Que Sais-je ?" n° 3468, ISBN 2 13 049840 X, 127 pages.
