Armstrong, W. E., & Stinnett, T. M. (1951). A manual on certification requirements for school presonnel in the United States: A manual on certification requirements for school presonnel in the United States : including forty.eight states, District of Columbia, teritories and outlying parts. Washington: Federal security agency.
Chicago stil citiranjaArmstrong, W. Earl, and T. M. Stinnett. A manual on certification requirements for school presonnel in the United States: A manual on certification requirements for school presonnel in the United States : including forty.eight states, District of Columbia, teritories and outlying parts. Washington: Federal security agency, 1951.
MLA stil citiranjaArmstrong, W. Earl, and T. M. Stinnett. A manual on certification requirements for school presonnel in the United States: A manual on certification requirements for school presonnel in the United States : including forty.eight states, District of Columbia, teritories and outlying parts. Washington: Federal security agency, 1951.