Lowrie, Charlotte K. <br/><br/>
Canon eos 50d digital field guide/ 
Charlotte K Lowrie. 
 - 1st ed. 
 - Indianapolis, IN:  Wiley Pub., Inc.,  2009. 
 - p. cm. 
<br/><br/><label>ISBN: </label>0470455594 9780470455593 
<br/><br/><label>LCCN: </label>2009920910