Borg, Walter R. <br/><br/>
Educational research :  an introduction / 
Walter R. Borg, Meredith Damien Gall. 
 - 4th ed. 
 - New York :  Longman,  1983. 
 - 936 p. ;  27 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational research.