United States. Soil Conservation Service. (1963). Land of Washington. U.S. Dept. of Agriculture, Soil Conservation Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Soil Conservation Service. Land of Washington. [Portland, Or.: U.S. Dept. of Agriculture, Soil Conservation Service, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Soil Conservation Service. Land of Washington. U.S. Dept. of Agriculture, Soil Conservation Service, 1963.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.