Bibliography

Krol, Jelle: Frisia and the World: Douwe Kalma During and Shortly After the First World War, in: Krol, Jelle (ed.): Minority Language Writers in the Wake of World War One: A Case Study of Four European Authors (Palgrave Studies in Minority Languages and Communities), Cham 2020 Palgrave Macmillan, pp. 19-74.

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