Thompson, M., & Freeman, O. W. (1950). The conservation of Northwest resources. Northwest Conservation League.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThompson, Margaret, और Otis W. Freeman. The Conservation of Northwest Resources. Seattle: Northwest Conservation League, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रThompson, Margaret, और Otis W. Freeman. The Conservation of Northwest Resources. Northwest Conservation League, 1950.
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