1.
Geneva [Switzerland] : World Intellectual Property Organization, 1979.
English | E 224:399 (F/E/S/R) |
2.
Geneva. Switzerland : World Intellectual Property Organization, 1979.
reprinted 1995.
English | E 224:399 |
3.
Geneva [Switzerland] : World Intellectual Property Organization, 1994.
English | E 224:399(C) |