Gay, L. R. <br/><br/>
Educational research :  Competencies for analysis and application / 
L. r. gay 
 - 3 
 - 469 páginas 
<br/><br/><label>ISBN: </label>0029461170 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educación--Investigación
<br/><br/><label>LC Class. No.: </label>LB1028  / G38 1990