(2000). Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPercentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPercentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.