Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Cita Chicago Style (17a ed.)Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Cita MLA (9a ed.)Percentage Distribution of 6- to 12-year-olds, 1972-97. US Department of Education.
Precaución: Estas citas no son 100% exactas.