(2000). Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education.
Cita Chicago Style (17a ed.)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
Cita MLA (8a ed.)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
Precaución: Estas citas no son 100% exactas.