Misra, R.P.. <br/><br/>
Research Methodology: A Hand book /  

 - 1st ed /  
 - New Delhi-59 :   Concept Publishing Company ,   1998 
 - p.89 :  
<br/><br/><label>ISBN: </label>81-7022-267-2 
<br/><br/><label>Dewey Class. No.: </label>SZ:f  / M8