Não informado. (1964). Soil and water. National Water and Soil Conservation Organization.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Soil and Water. Wellington: National Water and Soil Conservation Organization, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Soil and Water. National Water and Soil Conservation Organization, 1964.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.