Cliff, Norman. <br/><br/>
Ordinal measurement in the behavioural sciences / 
Norman Cliff, John A. Keats. 
 - London :  LEA,  2003. 
 - x, 230  p. 
<br/><br/><label>ISBN: </label>0805820930 :  GBP 59.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psychology--Mathematical models.<br/>Psychological tests--Statistical methods.