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Geneva, Switzerland : World Intellectual Property Organization, 1981.
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London : Published by Chapman & Hall on behalf of the United Nations Environment Programme, 1992. First edition.
English | C 389 UNEP.W |
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Gland, Switzerland : Iucn, 1994.
English | G 26 KRA.W |
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[Washington, D.C.] : World Resources Institute in cooperation with United Nations Environment Programme, the World Conservation Union, 1995.
Spanish | G 26 NAT |
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Oxford : Blackwell Reference, 1989. Second edition.
English | C 23 UNEP.E |
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