Langley, Russell. <br/><br/>
Practical statistics simply explained 

 - Rev. ed. 
 - New York  Dover Publications  c1970 
 - 399 p 
<br/><br/><label>ISBN: </label>0486227294 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics. Probabilities.
<br/><br/><label>LC Class. No.: </label>HA 29 .L266/