1.
Washington Dc : Pan American Union, [1990]
English | B 31 OAS.C |
2.
Paris [France] : Presses Universitaires De France (PUF), 1988.
3e.
English | B 31 RIA.T |
3.
4.
5.
6.
7.
Hong Kong : Government Printer (AUTHORITY), Hong Kon, 1969.
English | B 31 LET |
8.
9.
10.