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| 1 | Conferencia sobre el Medio Ambiente y el Desarrollo (1992. Rio de Janeiro, Brasil) The earth summit : the United Nations conference on environmental and development (UNCED) / introduction and commentary by Stanley P. Johnson ; Naciones Unidas . — London ; Norwell : Graham & Trotman ; Kluwer Academic, 1993. — 532 p. ; 25 cm. — ( International environmental law and policy) |  | ||
| 2 | Johnson, Stanley P. The environmental policy of the European Communities / Stanley P. Johnson, Guy Corcelle . — 3ª reimp. — London ; Norwell : Graham & Trotman ; Kluwer Academic publishers group, 1992. — xv, 349 p. : tab. ; 24 cm. — ( International environmental law and policy) |  |
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