Adams, Gerald R., <br/><br/>
Understanding research methods / 

 - New York   Longman,  1985. 
 - ix, 415 p. :  ill. ;  26 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0582284856 
<br/><br/><label>LC Class. No.: </label>H62  / .A1 1985