Citazione Stile APA (7a Edizione)

(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%.