43Tagebuch 20. XII. 1938 – 25. XII. 1939 [Rudolf Carnap: Tagebücher], Eintrag Fr 30. XII. 1938

Enzyklopädie-Heft.B1938@„Logical Foundations of the Unity of Science“, Foundations of the Unity of Science 1, 1938, 42–62IFoundations of the Unity of Science