(1999). Early Warning, Timely Response: A Guide to Safe Schools. U.S. Department of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEarly Warning, Timely Response: A Guide to Safe Schools. U.S. Department of Education, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEarly Warning, Timely Response: A Guide to Safe Schools. U.S. Department of Education, 1999.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.