Sing Y.K. <br/><br/>
Encyclopaedia of teaching (St of 11 Vlumes:)  Teching of Chemistry (volume x)/ 

 - New Delhi  APH Publshing corporation  2012 
 - 242 p.:  23 cm. 
<br/><br/><label>ISBN: </label>9.4788131316e+013 
<br/><br/><label>Dewey Class. No.: </label>31  / SIE 2012