Patnubay sa korepondensiya opisyal :   may kasamang ortograpiyang pambansa /  
Rogelio G. Mangahas at Leonida B. Villanueva, mga editor 
 - Ikaapat na edisyon.  
 - San Miguel, Manila :   Komisyon sa Wikang Filipino,   c2013. 
 - xviii, 473 p[ages :   illustrations ;   28 cm.  
<br/><br/> Includes index and bibliographical references.  
<br/><br/><label>ISBN: </label>979710197231 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tagalog language--Writing<br/>Government correspondence
<br/><br/><label>Dewey Class. No.: </label>Fil. 651.75 P311 2013