Sethi, M.S. <br/><br/>
Encyclopaedia of nature and environment 
M.S. Sethi, S.A. Iqbal. 
 - 2nd ed.. 
 - New Delhi  Discovery  1998 
 - 342p., ill.; 28cm. 
<br/><br/><label>Dewey Class. No.: </label>574.503  / S30E