1.
Detroit, MI : Omnigraphics, Inc., c1992.
Second edition.
English | C 11 GRE.W |
2.
3.
4.
5.
6.
7.
Calne, England : Infonortics Ltd., 1991.
English | D 70 PEL.I |
8.
New York : Nations Unies, 1991.
4e revue et aug.
French | A 41(111:113) ONU.L(4) |
9.
10.