Sowards, A. M. (2009). The environmental justice: William O. Douglas and American conservation. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSowards, Adam M. The Environmental Justice: William O. Douglas and American Conservation. Corvallis: Oregon State University Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSowards, Adam M. The Environmental Justice: William O. Douglas and American Conservation. Oregon State University Press, 2009.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.