Gregorion, Herman C. <br/><br/>Principles and methods of teaching Herman C. Gregorio  - Quezon City:  Garotech Publishing ;  [1976]  - xx, 580 pages  25 cm. <br/><br/>Includes index <br/><br/><label>ISBN: </label>9718711082 <br/><br/><label>LC Class. No.: </label>LB 1025.3  / .G821 1979