(2000). Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education.
Citazione stile Chigago Style (17a edizione)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
Citatione MLA (9a ed.)Percentage of Students Using Drugs During the Previous 30 Days: 1991-98. U.S. Department of Education, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.