TY  - BOOK
AU  - Bhattacharya, S. P.
TI  - Personalized system of instruction (PSI) or keller plan: a new approach in management of learning in India
SN  - 8120203771
U1  - 371.394 
PY  - 1992///
CY  - New Delhi
PB  - Ajanta publications
KW  - Education
KW  - Personalized system - PSI
ER  -