(2000). Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education.
Chicago-Zitierstil (17. Ausg.)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
MLA-Zitierstil (9. Ausg.)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.