Mayr, Ernst., Linsley, E.Gorton. and Usinger, Robert L. <br/><br/>
Methods and Principles of Systematic Zoology 

 - London  McGraw-Hill Book Company, Inc.  1953 
 - 336 
<br/><br/><label>Subjects--Personal Names: </label> Zoology 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology