TY  - BOOK
T1  - International directory of programmed instruction
LA  - English
LA  - French
PP  - Paris
PB  - Unesco
YR  - 1973
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217606819248
OP  - 191
NO  - General Reference}
CN  - (R) LB 1028.5 Z9 I57 1
KW  - Programmed instruction : Bibliography.
ER  -