TY  - BOOK
AU  - Gregorio,Herman C.
AU  - Gregorio,Cornelia M.
TI  - Principles of elementary-secondary education
AV  -  Fil LB1727 P5G73 1989 
U1  - 371.3 
PY  - 1989///
CY  - Quezon City
PB  - R.P. Garcia Pub
KW  - Education
KW  - Study and teaching (Elementary)
KW  - Philippines
N1  - Includes index
ER  -