REENBERG, A. World resources 1990-91: a report by The World Resources Institute, in collaboration with the United Nations Environment Programme and the United Nations Development Programme. Geografisk Tidsskrift, [S. l.], v. 92, 1992. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/44900. Acesso em: 17 jul. 2024.