APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1964). Soil and water. National Water and Soil Conservation Organization.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Soil and Water. Wellington: National Water and Soil Conservation Organization, 1964.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Soil and Water. National Water and Soil Conservation Organization, 1964.

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