(2000). Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education.
Čikaški stil citiranja (17. izdanje)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
MLA način citiranja (9. izdanje)Percentage Distribution of 6- to 12-year-olds, 1972-97. U.S. Department of Education, 2000.
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