(1973), “Joint Meeting of Study Groups on Development and on the Environment, London, June 27, 1973: Subjects proposed by Professor Tinbergen for study by World Plan Council”, Fundação Mário Soares e Maria Barroso / Mário Soares, Disponível em: https://casacomum.org/visualizador?cota=02497.063.001 (consultado em 2026-08-18)

Joint Meeting of Study Groups on Development and on the Environment, London, June 27, 1973: Subjects proposed by Professor Tinbergen for study by World Plan Council. Fundação Mário Soares e Maria Barroso, Mário Soares, 1973. Cota: 02497.063.001. [Consult. 18 ago. 2026]. Disponível em: https://casacomum.org/visualizador?cota=02497.063.001

(1973). Joint Meeting of Study Groups on Development and on the Environment, London, June 27, 1973: Subjects proposed by Professor Tinbergen for study by World Plan Council. Fundação Mário Soares e Maria Barroso, Mário Soares. https://casacomum.org/visualizador?cota=02497.063.001

“Joint Meeting of Study Groups on Development and on the Environment, London, June 27, 1973: Subjects proposed by Professor Tinbergen for study by World Plan Council,” 1973, Mário Soares, Fundação Mário Soares e Maria Barroso. https://casacomum.org/visualizador?cota=02497.063.001.