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037 _cTB
040 _aARTS
_cARTS
_beng
041 _2eng
_aeng
084 _aSigma:f P0.2
_qAL
100 _aBickman Leonard Ed.
_9142006
245 0 _aResearch design
260 _aLondon
_bSaga pub. inc.
650 _aSOCIAL SCIENCES; RESEARCH METHODS
_94097
942 _hSigma:f P0.2
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999 _c274338
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