Não informado. (1975). Dutch theses. Netherlands Universities Foundation for International Cooperation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Dutch Theses. The Hague, Holanda: Netherlands Universities Foundation for International Cooperation, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Dutch Theses. Netherlands Universities Foundation for International Cooperation, 1975.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.