Bruxelles, Bruylant, 1998, 378 p.
Vol. I et vol. 2-3, 1992. S. Brier, the Royal School of librarianship -Aalborgbranch Langagevej 4 -DK 922 0 - Aalborg Ost - Danemark
Cybernetics and Human Knowing Journal, Vol. 9, N° 2, 2001. 96 pages
Ed. Transaction Publisher. New Brunswick. N.J. 1992. 705 pages.