Não informado. (1974). AID research and development abstracts. Agency for International Development.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. AID Research and Development Abstracts. Washington: Agency for International Development, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. AID Research and Development Abstracts. Agency for International Development, 1974.
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