(1968). About the Sudbury Valley School. Sudbury Valley School.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbout the Sudbury Valley School. [Framingham]: Sudbury Valley School, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAbout the Sudbury Valley School. Sudbury Valley School, 1968.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.