Não informado. (1960). Bibliography. International Institute for Land Reclamation and Improvement.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bibliography. Wageningen, Holanda: International Institute for Land Reclamation and Improvement, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bibliography. International Institute for Land Reclamation and Improvement, 1960.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.