(2007). Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education.
Cita Chicago (17th ed.)Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education, 2007.
Cita MLA (9th ed.)Changes in Instructional Hours in Four Subjects by Public School Teachers of Grades 1 Through 4. U.S. Department of Education, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.