Lundgreen-Nielsen, Kay. “Harald Von Riekhoff: German-Polish Relations, 1918-1933. Baltimore & London. Johns Hopkins Press, 1971. 421 S. £ 7,15 ($l5)”. Historisk Tidsskrift 13 (januar 1, 1974). Set december 5, 2025. https://tidsskrift.dk/historisktidsskrift/article/view/51552.