(2000). Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education.
Chicago-Zitierstil (17. Ausg.)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
MLA-Zitierstil (9. Ausg.)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.