De Leon, Hector S. <br/><br/>
The law on sales, agency and credit transactions/ 
Hector S. De Leon and Hector M. De Leon, Jr. 
 - Manila:  Rex Book Store,  c2016. 
 - xliv, 490 pages ;  23 cm. 
<br/><br/><label>ISBN: </label>978-9-71238271-0