(2000). Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education.
Chicago-čujuhus (17. p.)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
MLA-čujuhus (9. p.)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
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