Statistical sources. 16 units 

 - Keynes  Open University           1975 
 - 64p.  cm. 
 -  Units 3 .
<br/><br/><label>ISBN: </label>0 335 04602 9 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social Sciences
<br/><br/><label>Dewey Class. No.: </label>Sigma s, L5.3