Clifford, H. T. <br/><br/>
An Introduction to numerical classification / 
by H. T. Clifford and W. Stephenson. 
 - New York :  Academic Press,  1975. 
 - xii, 229 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography : p. 209-224. 
<br/><br/><label>ISBN: </label>0121767507 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numerical taxonomy