Dyfyniad APA

(2000). Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. U.S. Department of Education.

Dyfyniad Arddull Chicago

Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. U.S. Department of Education, 2000.

Dyfyniad MLA

Percentage of High School Seniors Using Alcohol or Drugs: 1975-98. U.S. Department of Education, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.