Manuel, Herschel T. <br/><br/>
Development of inter-American test materials / 
Herschel T. Manuel. 
 - Austin [E.U.A.] :  University of Texas,  1966. 
 - 99 p. 
<br/><br/> "U.S. Department of Health, Education and Welfare Project no.2621" 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Mediciones y pruebas educativas