History of Islamic legal theories  an introduction to Sunni Usul al fiqh 
Wael B. Hallaq. 
 - Cambridge  Cambridge University Press  1999 
 - ix, 294p., 23cm. 
<br/><br/><label>ISBN: </label>0-521-59986-5. 
<br/><br/><label>Dewey Class. No.: </label>340.59  / H16H