Griffiths, S. R. & Downes, L. W. <br/><br/>
Educational statistics for beginners 

 - Methuen educational, London  1969 
 - vi,151 
<br/><br/><label>ISBN: </label>423 42880 2 
<br/><br/><label>Dewey Class. No.: </label>370 Gri/Dow