Não informado. (1964). International agricultural development. International Agricultural Development Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. International Agricultural Development. Washington: International Agricultural Development Service, 1964.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. International Agricultural Development. International Agricultural Development Service, 1964.
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