Marshall,A.J. <br/><br/>
Text Book of Zoology Invertebrates 

 - London  Macmillan Press Ltd  1972 
<br/><br/><label>ISBN: </label>333 14107 5 
<br/><br/><label>LC Class. No.: </label>592/MAR 
<br/><br/><label>Dewey Class. No.: </label>592/MAR