(2000). Trends in Science Performance of 9-, 13-, & 17-year olds. U.S. Department of Education.
Chicago Style (17. basım) AtıfTrends in Science Performance of 9-, 13-, & 17-year Olds. U.S. Department of Education, 2000.
MLA (9th ed.) AtıfTrends in Science Performance of 9-, 13-, & 17-year Olds. U.S. Department of Education, 2000.
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