Sokal, Robert R. <br/><br/>
Principles of numerical taxonomy/ 
by Robert R. Sokal, Peter H. A. Sneath. 
 - San Francisco. :  W.H. Freeman,  1963 
 - xvi, 359 p. :  ill, diagrs. ;  25 cm. 
 - A Series of books in biology. .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numerical taxonomy.