Perie, M., Baker, D. P., & Bobbitt, S. (1997). Time Spent Teaching Core Academic Subjects in Elementary Schools: Time Spent Teaching Core Academic Subjects in Elementary Schools : comparisons across community, school, teacher, and student characteristics. Washington: U. S. Department of Education.
Chicago stil citiranjaPerie, Marianne, David P. Baker, and Sharon Bobbitt. Time Spent Teaching Core Academic Subjects in Elementary Schools: Time Spent Teaching Core Academic Subjects in Elementary Schools : comparisons across community, school, teacher, and student characteristics. Washington: U. S. Department of Education, 1997.
MLA stil citiranjaPerie, Marianne, David P. Baker, and Sharon Bobbitt. Time Spent Teaching Core Academic Subjects in Elementary Schools: Time Spent Teaching Core Academic Subjects in Elementary Schools : comparisons across community, school, teacher, and student characteristics. Washington: U. S. Department of Education, 1997.