Não informado. (1975). Dutch theses. Netherlands Universities Foundation for International Cooperation.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Dutch Theses. The Hague, Holanda: Netherlands Universities Foundation for International Cooperation, 1975.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Dutch Theses. Netherlands Universities Foundation for International Cooperation, 1975.
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