00522nam a2200181Ia 450000500170000000800460001702000180006303700120008104000200009304100130011308400190012610000230014524500590016826000570022730000120028436500130029665000310030920250508163712.0008  250505s9999    xx            000 0 eng d  a81-7024-865-5  aTextual  aFEDLbengcFEDL  aeng2eng  a507, GUPqFEDL  aGupta Naresh Kumar 0aResearch in teaching of science: Models and strategies  aNew Delhi, India bAPH Publishing Corporation c1997  ax,210p.  aINRb300  aScience teaching- Research