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100   $a20000920d1989----km-y0itay50------ba
101 0 $aita
102   $aIT
200 1 $aCase Study Research$eDesign and Methods$fRobert K. Yin$gForeword by Donald T. Campbell.
205   $aRev. ed.
210   $aNewbury Park$aLondon$cSage$d1989.
215   $a164 p.$d22 cm
225 1 $aApplied Social Research Methods Series$v5
610 0 $aScienze sociali$aRicerca$aMetodologia
676   $a11130
702  1$aCampbell,$bDonald Thomas
702  1$aYin,$bRobert K.
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