1. 3. Development of State Programs for Certification of Teachers, p. 15.
2. 4. Requirements by State Departments of Education for Teachers and Supervisors of Physical Education and Health Education in Elementary and Secondary Schools. Circular No. 35. Washington, D.C.: U.S. Office of Education, 1924.
3. 5. Woellner, Elizabeth and M. Aurilla Wood . Requirements for Certification of Teachers, Counselors, Librarians, and Administrators for Elementary Schools,Chicago: University of Chicago Press, Secondary Schools, and Junior Colleges. 1967..