TY  - BOOK
AU  - Bhattacharya, S.P.
TI  - Personalized system of instruction (PSI) or Keller Plan
SN  - 8120203771
U1  - 371/BHA 
PY  - 1992///
CY  - Delhi
PB  - Ajanta Publications
KW  - Education
KW  - Learning
KW  - Teaching, Learning
KW  - Teaching
N1  - Includes bibliography
ER  -