Não informado. (1961). Development Assistance. Organization for Economic Co-operation and Development.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Development Assistance. Paris: Organization for Economic Co-operation and Development, 1961.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Development Assistance. Organization for Economic Co-operation and Development, 1961.
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