Gregorio, Herman C. <br/><br/>
Principles of elementary-secondary education / 
by Herman C. Gregorio and Cornelia M. Gregorio. 
 - Revised edition. 
 - Quezon City :  R.P. Garcia Publishing Company, Incorporation,  c1989. 
 - viii, 244 pages  22 cm 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education.