"Ernst Troeltsch an Helmer Key, Svenska Dagbladet". Band 21 Briefe IV (1915–1918), edited by Friedrich Wilhelm Graf, Berlin, Boston: De Gruyter, 2018, pp. 79-83. https://doi.org/10.1515/9783110583533-010
(2018). Ernst Troeltsch an Helmer Key, Svenska Dagbladet. In F. Graf (Ed.), Band 21 Briefe IV (1915–1918) (pp. 79-83). Berlin, Boston: De Gruyter. https://doi.org/10.1515/9783110583533-010
2018. Ernst Troeltsch an Helmer Key, Svenska Dagbladet. In: Graf, F. ed. Band 21 Briefe IV (1915–1918). Berlin, Boston: De Gruyter, pp. 79-83. https://doi.org/10.1515/9783110583533-010
"Ernst Troeltsch an Helmer Key, Svenska Dagbladet" In Band 21 Briefe IV (1915–1918) edited by Friedrich Wilhelm Graf, 79-83. Berlin, Boston: De Gruyter, 2018. https://doi.org/10.1515/9783110583533-010
Ernst Troeltsch an Helmer Key, Svenska Dagbladet. In: Graf F (ed.) Band 21 Briefe IV (1915–1918). Berlin, Boston: De Gruyter; 2018. p.79-83. https://doi.org/10.1515/9783110583533-010