Clarkson, E.N.K. <br/><br/>
Invertebrate palaeontology and evolution / 
by E.N.K. Clarkson 
 - 4th ed. 
 - New Delhi:  Wiley India Pvt. Ltd.,  1998. 
 - xiv, 452p. 
<br/><br/><label>ISBN: </label>9788126533084 
<br/><br/><label>Dewey Class. No.: </label>K1  / N8