Introductory functional analysis with applications 
Kreyszig, Erwin. 
 - Malabar, Fla. :  Krieger Pub. Co.,  1978 
 - xiv, 688 p. :  ill. ;  24 cm. 
<br/><br/> Reprint. Orginally published: New York : Wiley, c1978. | Includes index. 
<br/><br/><label>ISBN: </label>0471507318 | 0894643320 (alk. paper)