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_9143455 _aCohen, Louis, _d1928- , _eautor |
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_aMétodos de investigación educativa / _cLouis Cohen, Lawrence Manion. |
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_aMadrid : _bLa Muralla, _c1990. |
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_a502 páginas : _bilustraciones |
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_927558 _aEducación _xInvestigaciones _xMetodología. |
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_999240 _aManion, Lawrence. _eautor |
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