Greenwood, <br/><br/>
Sams Teach Yourself Abap/4 In 21 Days : 

 -  Pearson Education India,  1998. 
 - 756 pages 
<br/><br/><label>ISBN: </label>9788131716113 
<br/><br/><label>Dewey Class. No.: </label>650.028553769  / GRE