00631nam a2200229Ia 4500 131103s9999 xx 000 0 und d 8120203771 Rs 85 Loreto College English 371/BHA LCLIB/EduSem/44493 Bhattacharya, S.P. Personalized system of instruction (PSI) or Keller Plan Delhi Ajanta Publications 1992 44p 20 cm Includes bibliography Education Learning Teaching, Learning Teaching LCLIB/EduSem/371/BHA BK 12738 63217 0 0 0 0 MAIN MAIN 2013-11-04 0 371/BHA LCLIB/EduSem/44493 B12718 2013-11-04 2013-11-04 BK