Essential statistics for social research/ 
Malec,Michael A. 
 - 2nd.ed. 
 - Jaipur:  Rawat publications,  1993. 
 - 291 
<br/><br/><label>ISBN: </label>9788131605509 
<br/><br/><label>Dewey Class. No.: </label>300.72  / MAL/E