Historians and written sources: general problems. Ernst Opgenoorth In: "European sources for Sub-Saharan Africa before 1900 : use and abuse / edited by Beatrix Heintze and Adam Jones.". Pp 107-114. 1987 1 theory and philosophy of historiography source criticism
Enzyklopädie der geisteswissenschaftlichen Arbeitsmethoden Manfred Thiel R Bäumlin Ernst Opgenoorth Karl Acham Heinrich Fichtenau 1974 1 theory and philosophy of historiography sociology/social science