Conferencia de las Naciones Unidas sobre el Medio Ambiente y Desarrollo & Johnson, S. P. (1993). The Earth summit, the United Nations Conference on Environment and Development (UNCED): [held in Rio de Janeiro, Brazil, June 3-14, 1992]. Graham & Trotman.
Chicago Style (17th ed.) CitationConferencia de las Naciones Unidas sobre el Medio Ambiente y Desarrollo and Stanley P. Johnson. The Earth Summit, the United Nations Conference on Environment and Development (UNCED): [held in Rio De Janeiro, Brazil, June 3-14, 1992]. London [etc.]: Graham & Trotman, 1993.
MLA (9th ed.) CitationConferencia de las Naciones Unidas sobre el Medio Ambiente y Desarrollo and Stanley P. Johnson. The Earth Summit, the United Nations Conference on Environment and Development (UNCED): [held in Rio De Janeiro, Brazil, June 3-14, 1992]. Graham & Trotman, 1993.