Rainville, Earl David, <br/><br/>
Elementary Differential Equations 

 - Upper Saddle River, NJ :  Prentice Hall,  1997 
 - xiii, 530 p. : 
<br/><br/><label>ISBN: </label>0135080118 
<br/><br/><label>Dewey Class. No.: </label>515.35  / RAI