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*24500$aAltruism and helping behavior :$bsocial psychological studies of some antecedents and consequences$cedited by J. Macaulay and L. Berkowitz
*260  $aNew York$bAcademic Press$c1970
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*7001 $aBerkowitz, Leonard$0(NO-TrBIB)90051358$_53716800
*7001 $aMacaulay, J.$0(NO-TrBIB)90569536$_100112200
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