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| 020 | _a81-7141-548-2 | ||
| 082 | _a620.03 ZRao.P;N9 | ||
| 100 | _aRao,Digumarti Bhaskara ed. | ||
| 245 | 0 | _aInternational encyclopaedia of science and tecnology education.vol.9 | |
| 260 |
_c2000 _bDiscovery pub. house _aNew Delhi |
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| 300 | _a334p. | ||
| 942 | _cSU | ||
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