A first course in string theory/ 
Zwiebach,Barton 
 - 2nd ed. 
 - Cambridge:  Cambridge University Press,  2009. 
 - 673 p. 
<br/><br/><label>ISBN: </label>9780521176330 
<br/><br/><label>Dewey Class. No.: </label>539.7258  / ZWI/F