Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. US Department of Education.
Citazione stile Chigago Style (17a edizione)Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. US Department of Education.
Citatione MLA (8a ed.)Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. US Department of Education.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.