Manwal sa korespondensya opisyal. 

 - Manila :  National Book Store,   1990. 
 - xxvi, 364 pages :  illustration ;   23 centimeter 
<br/><br/><label>ISBN: </label>8705031 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business letters.
<br/><br/><label>Dewey Class. No.: </label>FIL 383.122 M31 1990