Derrick, William R. <br/><br/>
Elementary differential equations / 
William R. Derrick 
 - Fourth Edition 
 - 404 pages, An 23  Illustrations;  26 cm 
<br/><br/>
<br/><br/><label>ISBN: </label>0-321-04538-6 
<br/><br/><label>Dewey Class. No.: </label>515.35 D4382 1997