Invitation to Morse theory 
Nicolaescu, Liviu I. 
 - New York :  Springer,  2007 
 - xiv, 241 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9780387495095 (pbk.) | 0387495096 (pbk.) | 9780387495101 (ebk.) | 038749510X (ebk.)