Gregorio, Herman Cruz <br/><br/>Principles and methods of teaching / Herman C. Gregorio.  - REVISED EDITION  - Quezon City :  R. P. Garcia,  1976.  - xx, 580 pages <br/><br/><label>ISBN: </label>9718711082 <br/><br/><label>LC Class. No.: </label>LB 1025  / G74 1976