Não informado. (1961). Netherlands Journal of Sea Research. Netherlands Institute for Sea Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Netherlands Journal of Sea Research. Texel, Holanda: Netherlands Institute for Sea Research, 1961.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Netherlands Journal of Sea Research. Netherlands Institute for Sea Research, 1961.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.