(2007). Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education.
Chicagoスタイル(17版)引用形式Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education, 2007.
MLA(9版)引用形式Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education, 2007.
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