Leighton, W. <br/><br/>
Introduction to the theory of ordinary differential equations   
by W.Leighton 
 - California  Wadsworth Publishing Company  1976 
 - xii, 249p. 
<br/><br/><label>ISBN: </label>0534004326 
<br/><br/><label>LCCN: </label>75-16957 
<br/><br/><label>Dewey Class. No.: </label>515.352  / N761