Cita APA (7th ed.)

(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.