1.
|
New York, New York : Copyright Society of the USA, 1981.
English | 14 US |
|
2.
|
[Place of publication not identified] : [publisher not identified], 1985.
English | 63 FR |
|
3.
|
[Geneva, Switzerland] : [World Intellectual Property Organization], 1968.
English | 6B OMPI |
|