(2000). Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education.
Citazione stile Chigago Style (17a edizione)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
Citatione MLA (9a ed.)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.