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1.
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London : Penguin Books, c1995.
English | C 23 PAR.F |
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2.
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New York : Twentieth Century Fund Press, 1995.
English | C 23 RIG.U |
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3.
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Geneva [Switzerland] : World Intellectual Property Organization, 1983.
English | E 2310G170 WIPO.DRK/SPI (E/R) |
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4.
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[Place of publication not identified] : [publisher not identified], 1981.
English | C 11 UN.H |
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