Donald T. Campbell1916 · 6 obras en el catálogoObrasLLeadership and its effects upon the groupLeadership and its effects upon the groupExperimental and quasi-experimental designs for researchLLeadership and its effects upon the groupLeadership and its effects upon the groupVVarieties of projection in trait attributionVarieties of projection in trait attributionSocial research and public policiesScientific inquiry and the social sciences