De leon, Elmer B., <br/><br/>
Acttion research / 
De Leon, Elmer B. 
 - Quezon City, Philippines :  Lorimar Publishing, Inc.,  2019 . 
 - xi, 214 pages:  illustrations, figures:  22 cm.  index 
<br/><br/>includes bibliographic references 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>9786218035676 
<br/><br/><label>Dewey Class. No.: </label>317.39  / D346