De Leon, Hector S. <br/><br/>
Administrative law :   text and cases/ 
Hector S. De Leon, Hector M. De Leon, Jr. 
 - Fourth edition 
 - Manila:  Rex Book Store,  c2001. 
 - xi, 434 pages ;  24 cm. 
<br/><br/><label>ISBN: </label>9-71233085-0