Não informado. (1969). Journal of Development Planning. United Nations, Department of Economic and Social Affairs.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Development Planning. New York: United Nations, Department of Economic and Social Affairs, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Development Planning. United Nations, Department of Economic and Social Affairs, 1969.
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