Medina, Antonio L.,  1950- <br/><br/>
Principles of economics :  cases and problem / 
Antonio L.  Medina, Spencer L. Laurence, and Spencer L. Seager. 
 - Fourth edition. 
 -  ,  . 
 -  ;  . 
<br/><br/>Includes bibliographical references and index. 
<br/><br/>by chapter 
<br/><br/><br/>Spanish 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry--Textbooks.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Philippines.