Kauffman, E. The Conservation yearbook. Conservation yearbook.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKauffman, Erle. The Conservation Yearbook. Baltimore, Md. [etc.]: Conservation yearbook.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKauffman, Erle. The Conservation Yearbook. Conservation yearbook.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.