TY  - BOOK
T1  - Preparing educational materials.
T2  - New patterns of learning series
A1  - Harris, N.D.C
LA  - English
PP  - London
PB  - Croom Helm Ltd.
YR  - 1979
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217609259472
OP  - 153
CN  - 1243.2 H37
SN  - 0 85664 932 5
KW  - Educational material.
ER  -