University of combridge   the best and the average in productivity studies and inlog-term Forcasting    

 - s.l  s.n.            1957 
 - 132-40 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X:2.56 N57, J7.132-40