Sax, Gilbert <br/><br/>
Empirical foundations of educational research / 
Gilbert Sax 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1968 
 - xiii, 443 p. :  ill. ;  24 cm. 
<br/><br/> Published in 1979 under title: Foundations of educational research 
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research