TY  - BOOK
T1  - Elementary social studies as a learning system.
A1  - Martorella, Peter H.
LA  - English
PP  - New York
PB  - Harper & Row
YR  - 1976
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217603722387
OP  - 512
CN  - LB 1584 M38
KW  - Social sciences : Study and teaching (Elementary).
ER  -