Elementary differential equations with boundary value problems / 
Ewards, C. Henry ; Penney, Daved E. 
 - 6th ed. 
 - England :  Pearson Education limited,  2014. 
 - ii, 766 p.: 28cm. 
<br/><br/>Includes: appendix, answer to selected problems, index 
<br/><br/><label>ISBN: </label>9781292025339 
<br/><br/><label>Dewey Class. No.: </label>C 515.35 Ed261 2014