00331nam a2200121Ia 450000500170000000800410001704100080005808200150006610000280008124500520010926000390016130000090020020260720174552.0260720s2004    xx            000 0 und d  aeng  a500.7 SIDR  aSiddiqui, Hasan Mujibul  aResearch in teaching of science and mathematics  aNew DelhibAshish Publishingc2004  a309p