- State Certification of Early Childhood Teachers: An Analysis of the 50 States and the District of Columbia (752)
- A manual on certification requirements for school personnel in the United States: Including requirements in the fifty states, the District of Columbia, ... schools; exchange and study abroad by William Earl Armstrong, 1964
- A manual on certification requirements for school personnel in the United States,: Including requirements in the forty-eight States, Alaska, District of Columbia, Hawaii, and Puerto Rico by W. Earl Armstrong, 1957
- State certification of early childhood teachers: An analysis of the 50 states and the District of Columbia by Jan McCarthy, 1988
- State Certification of Early Childhood Teachers: An Analysis of the 50 States and the District of Columbia #752 by McCarthy, 1988-06
- Certification requirements for school personnel,: Including forty-eight States, District of Columbia, Territories and outlying parts, ([U.S.] Office of Education. Circular) by W. Earl Armstrong, 1951
- A manual on certification requirements for school personnel in the United States,: Including requirements in the fifty states, the District of Columbia, and Puerto Rico, by William Earl Armstrong, 1959
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