"Erkenntnistheorie." . . . . "Groupes sociaux." . . "The nature of social reality; an essay in the epistemology of empirical sociology" . "The nature of social reality : an essay in the epistemology of empirical research"@en . . . "Nature of social reality, the. an essay in epistemology of empirical sociology" . . . . "The nature of social reality an essay in the epistemology of empirical sociology" . "The nature of social reality an essay in the epistemology of empirical sociology"@en . . . . . . . . . . . . . . "The nature of social reality : an essay in the epistemology of empirical sociology"@en . "The nature of social reality : an essay in the epistemology of empirical sociology" . . . . . . . "The Nature of Social Reality : an Essay in the Epistemology of Empirical Sociology" . . . . "The nature of social reality"@en . "The nature of social reality" . . . . . . . . . "The Nature of social reality. An essay in the epistemology of empirical sociology"@en . . . . "Wetenschapsfilosofie." . . "Sociology." . . "Sociologie." . . "Empirische Sozialforschung." . . "Empirisch sociaal onderzoek." . . "Social groups." . .