Olsen, Wendy. <br/><br/>
Data Collection / 
By Wendy Olsen. 
 - 1st Ed. 
 - Jaipur :  Sagar publisher,  2012. 
 - 234p. ;  00 cm. 
<br/><br/><label>ISBN: </label>9781847872562 
<br/><br/><label>Dewey Class. No.: </label>300.72  / OLS