Não informado. (1969). Journal of Development Planning. United Nations, Department of Economic and Social Affairs.
Chicago-referens (17:e uppl.)Não informado. Journal of Development Planning. New York: United Nations, Department of Economic and Social Affairs, 1969.
MLA-referens (8:e uppl.)Não informado. Journal of Development Planning. United Nations, Department of Economic and Social Affairs, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.